Arcane Bombardment + Prismari Command + Return the Favor Combo

Arcane Bombardment on the battlefield.

Prismari Command in exile (Prismari Command exiled by Arcane Bombardment in exile).

Return the Favor in hand.

You have no instants and/or sorceries in your graveyard. You have an additional instant or sorcery card in hand. You have not cast an instant or sorcery this turn.

plus the mana needed to cast the additional instant/sorcery available

Cast any other instant or sorcery by paying its mana cost, triggering Arcane Bombardment.

Holding priority, cast Return the Favor by paying and then choosing to pay an additional to select its first mode, copying the Arcane Bombardment trigger.

Resolve the copy of the Arcane Bombardment trigger, exiling Return the Favor from your graveyard and then copying Return the Favor, Prismari Command and all other cards exiled by Arcane Bombardment, and allowing you to cast those copies without paying their mana costs.

As you cast the Return the Favor copy, choose to pay an additional to select its first mode, targeting the Arcane Bombardment trigger.

Resolve the copy of Prismari Command, creating a Treasure token and choosing any other mode.

Activate the Treasure by tapping and sacrificing it, adding .

Resolve the copy of Return the Favor, copying the Arcane Bombardment trigger.

Repeat from step 3.

Infinite damage

Infinite storm count

Infinite magecraft triggers

Infinite draw triggers for any number of players

Infinite looting for any number of players

Infinite self-discard triggers for any number of players