The Tramplesaurus Rex Commander deck contains the following:

• 1 Ready-to-play 100-card Commander deck
• 1 Traditional foil face commander with borderless art
• 99 Non-foil cards
• 10 Non-foil double-sided tokens
• 1 Reference card
• 1 Deck box

Ghalta, Primal HungerGhalta, Primal Hunger

If we're looking for the simplest commander of this set of preconstructed decks, this is it. Twelve mana is a lot, but we're never going to cast her for that much. That's because her cost is reduced by the total number of power among our creatures (so, if we have two 1/1s, then Ghalta costs two less to cast). Note that this also gets around the commander tax (where we pay an extra two mana to recast a commander from the command zone) because that gets reduced as well.

Ghalta needs us to have a few big creatures to easily get her out, but what we'll see in the next paragraph will eclipse what we have out, stats-wise. What we get is a beefy 12/12 with trample. Plain and simple, but don't let that fool you: those are scary numbers, and this precon taps into our commander rather well, as we'll soon learn.

Surrak and GoreclawSurrak and Goreclaw: An absolute powerhouse in any green deck. Six mana is nothing in green, where ramp is at its strongest. For that much, we give our other creatures trample and entering creatures get a small boost. Part of that boost so happens to be haste, which is rare in this color. All of this combines to a justifiably high price, so it's great that this card got reprinted here.

Birds of ParadiseBirds of Paradise: A classic mana dork (creatures that tap for mana). While it won't reduce the cost of our commander, it can come down on turn one if it's in our first eight cards, and can tap for mana on the following turn (once summoning sickness goes away). And while it'll only be tapping for green here, it's even better in decks using multiple colors.

Unnatural GrowthUnnatural Growth: Quadruple green all but ensures we'll usually only see this card in either one or two color decks. But here, all of our creatures are suddenly scary huge. Even our commander herself will kill an opponent in one hit with commander damage (21 combat damage is needed here. Ghalta will be at 24 power). It also works during each combat, so any blockers you have will be sure to deter opponents from touching us.

Ezuri's PredationEzuri's Predation: Another rare thing in green is board wipes, and this is actually one of the better ones, if not the best. Again, don't let all these expensive casting costs fool you. We can easily get that high in green, and this will either leave behind a board full of considerably beefy tokens, clear the board, or both!

Yeva, Nature's HeraldYeva, Nature's Herald: A welcome addition here. Flash ensures that we can cast stuff on our opponents' turns, but she only gives green creatures the ability. She's best used if you got an enters-the-battlefield (ETB) trigger in response to something. But here? We're flashing in big monsters on their turns, so we can attack with them once we get to take our turn again.

If you've read my Reign of Dragons guide, then I'm mostly going to reiterate the same thing here: it's simple, really. Ramp really hard, drop giant beefcakes, then ram them into your opponents. However, in green, it's even easier to do so. We have access to the best ramp spells to ensure we have big tracts of land and the biggest creatures. We also gain access to some good ways to draw cards, too. If the precon has weaknesses, it's slow to get going, and chances are, we're likely dropping one threat at a time.

That said, we should also be trying to quickly get Ghalta, Primal HungerGhalta, Primal Hunger out into play, so we can start swinging with our favorite T-Rex.

• Whisperer of the WildsWhisperer of the Wilds: Another mana dork, but this can tap for two mana if we control a creature with power 4 or greater. Otherwise, it'll just tap for one. Either way, it's ramp, and that'll help get those monsters out. It does have 0 power, so it's not making Ghalta any cheaper through her effect. On the other hand, tapping for two mana is a boon, allowing us to accelerate our game plan.
• Steel Leaf ChampionSteel Leaf Champion: The text box is not why this is in here. For three mana, we get a considerably sized beater that reduces Ghalta's casting cost by five. Nothing too much beyond that, but if we are attacking with it, this can bypass all of those small creatures opponents will likely have out, including tokens. There are other creatures like this in the deck (cheap to cast, but have high stats), so be sure to look for them when trying to rush out Ghalta.
• Ram ThroughRam Through: I'm using this card metaphorically, but it is a great way to remove a troublesome blocker (and we get to deal excess damage to our opponent if our creature has trample). No, the real card I mean to tag is Overwhelming StampedeOverwhelming Stampede, which will likely give +12/+12 and trample to all of our creatures (assuming Ghalta's out), very likely winning us the game. Otherwise, the buff will be weaker, but still potent. We'll need a well-developed board to ensure we get the most out of the card, so it's a case of timing this right to win out of nowhere.

As with most precons, especially ones aimed at newer players, there are no innate combos within the deck, but there's nothing really synergistic this time. Green truly is the simplest color in the game, which honestly is great. Everything is pretty straightforward here.

If you were to want to include combos in this deck, here are some suggestions:

Since we already have Surrak and GoreclawSurrak and Goreclaw, we can add a copy of Aerie OuphesAerie Ouphes to create a possible inflinite loop of death triggers and creature ETBs. All we need is to have an opponent who possesses a flying creature:

We'd want to sacrifice Aerie Ouphes with its ability targeting an opponents' (or our own, if we had any) flying creature. The Ouphes' persist trigger brings it back with a -1/-1 counter, which is then nullified by Surrak and Goreclaw's gift of a +1+1 counter. We can repeat this for as long as there's a flying creature to target. And if Verdant Sun's AvatarVerdant Sun's Avatar is on the battlefield to see it, that means we gain a ton of life in the process.

For something a little more straightforward (and useful), there's also an easy combo we can add to make use of Llanowar TribeLlanowar Tribe:

Adding Umbral Mantle and attaching it to Llanowar Tribe means that their ability to produce three mana goes infinite with the Mantle's untap ability. While the combo's net-neutral in terms of mana production (unless we swap out Llanowar Tribe with Fanatic of RhonasFanatic of Rhonas, which we'll get to in a moment), it does produce an infinitely large Llanowar Tribe, and who wouldn't want that?

Mana rocks (artifacts that tap for mana) are seldom used in a Mono-Green list, but there's a few worth noting. That said, there are some lands worth discussing, too.

• Rhonas's MonumentRhonas's Monument: Not a mana rock, per se, but it makes it easier to cast our big, scary creatures. When we do, we get to give a creature already in play +2/+2 and trample, which is a good rate. One of the few mana rocks I'd run here.
• Mosswort BridgeMosswort Bridge: Yes, we exile a card to the hideaway trigger, meaning it'd be gone forever, but we can cast it if we fulfill the condition. Fortunately, that condition is very easy to fulfill in this deck. Our commander alone enables it, but a small group of big creatures can do it, too.
• Witch's ClinicWitch's Clinic: Like I said earlier, this will be a slow deck to play, and our faster opponents will be hitting us with their creatures. Giving one of our big creatures lifelink ensures we can make up for being as slow as we are.
• Rogue's PassageRogue's Passage: Want to ensure something gets through (like, I don't know, a certain 12/12 commander?)? Look no further. We do have to pay four mana, which is more than you'd think. While trample is a form of evasion, if we really wanted to push through commander damage, this is the way.

As with every precon, they're the foundations from which we can make something our own. But first, we need to cut some cards. Here's the first five I recommend.

• Commander's SphereCommander's Sphere: If I must explain why for the fourth or fifth time: we can do much better. Even more so than usual, since we're in green.
• Arasta of the Endless WebArasta of the Endless Web: She's not a big monster, and we're not likely to get as many tokens as we'd like.
• Clifftop LookoutClifftop Lookout: While this does give us a land, we can do better for three mana. Much better.
• Rishkar, Peema RenegadeRishkar, Peema Renegade: He's more at home in a +1/+1 Counters deck, not here.
• Paradise DruidParadise Druid: Even among mana dorks we can do better, and she's not always hexproof, so if we tap her for mana, she'll lose the ability.

There's a ton of sweet budget options in green, especially under $5 (at time of writing). I'd choose the following:

• CultivateCultivate: If I were to pick a three mana ramp spell for being iconic, this would be it (Kodama's ReachKodama's Reach, too).
• Majestic GenesisMajestic Genesis: Eight mana, reveal top 12, and get a chance at slamming a bunch of scary creatures into play? Yes please!
• Return of the WildspeakerReturn of the Wildspeaker: Rishkar's ExpertiseRishkar's Expertise, but we don't get to cast anything off it. We do get to cast it at instant speed, which is even better.
• Selvala, Heart of the WildsSelvala, Heart of the Wilds: That's going to be a lot of mana. Getting potentially 12 mana is an absurd rate. Go nuts. And we're also likely the ones to get drawing cards off that trigger.
• Wayward SwordtoothWayward Swordtooth: A three-mana Dinosaur that allows us to make an additional land drop on our turns is nothing to scoff at. Once we get the City's Blessing (a reminder thing that sticks with us for the rest of the game), we have a 5/5 that can start swinging or blocking.

Perhaps, instead, you planted some money trees and want to get spendy. Here's my five choices to add.

• Heroic InterventionHeroic Intervention: We have a bunch of protection spells in the deck (like Tamiyo's SafekeepingTamiyo's Safekeeping), but this protects our entire board at two mana. A green essential, if you like.
• Fanatic of RhonasFanatic of Rhonas: Sure, it starts out as a mana dork, but one big creature later, than this can tap for four. Perhaps one of the easier way to get our commander out.
• The Skullspore NexusThe Skullspore Nexus: Like Ghalta, Primal HungerGhalta, Primal Hunger, we can quickly get this out. Then, when each creature dies, we get a big Dinosaur. Also, that activated ability with Ghalta can kill out of nowhere.
• Gwenna, Eyes of GaeaGwenna, Eyes of Gaea: For three mana, we're tapping for two, but only for creature spells and their activated abilities. If we cast a creature that costs five or more, we can untap her and do it again.
• The Great HengeThe Great Henge: Like Skullspore and Ghalta, this will easily come down. Once it does, it ramps us, and draws us a card when we have a nontoken creature enter. It does everything, quite literally (except remove stuff).

Lastly, if you want to take this deck to Bracket 3, then my top recommendation is to load up on the mana dorks and try to make our ramp spells cost two or less as much as we can. As for Game Changers, both Worldly TutorWorldly Tutor and Natural OrderNatural Order both let you search for creatures needed. The former is an instant, but will put it on top of your library while the latter has you sacrifice a creature to tutor. For your third one, look no further than Gaea's CradleGaea's Cradle, which can potentially tap for more mana than we know what to do with.

For a newer player, this is an excellent starting point. Green tends to be a very easy color for those new to the game to master, and this precon doesn't disappoint. For the experienced player, while they are likely to have some of these cards, it doesn't hurt to pick this up to help begin their own Ghalta, Primal HungerGhalta, Primal Hunger build.

For this precon, I give it a solid, enthusiastic A all around. There's beauty in simplicity, and this precon exemplifies that.