The Tenth Doctor + Taigam, Master Opportunist + Temporal Mastery Combo

Temporal Mastery in hand.

Self-Suspending Instant or Sorcery in hand or in exile (Self-Suspending Instant or Sorcery with time counter(s) on it in exile).

The Tenth Doctor and Taigam on the battlefield.

You have a storm count of 1 if the self-suspending card is not in your hand, or a storm count of 0 otherwise.

You have enough mana to cast Temporal Mastery and the self-suspending card, if needed, during the first turn.

each extra turn available

Cast the self-suspending card by paying its mana cost if its in your hand, or any other spell otherwise if you have not cast a spell this turn.

Cast Temporal Mastery by paying its mana cost.

Taigam triggers, copying Temporal Mastery and then exiling it with four time counters on it and giving it suspend.

Resolve the copy of Temporal Mastery, causing you to take an extra turn after this one.

Move to your next turn. At the beginning of that turn's upkeep, Temporal Mastery and the self-suspending card's suspend abilities trigger, removing a time counter from each of them.

Activate The Tenth Doctor by paying , removing three time counters from Temporal Mastery and the self-suspending card, triggering their suspend abilities.

Resolve the self-suspending card's suspend trigger, causing you to cast it from exile without paying its mana cost, and eventually exile it with time counters on it.

Resolve the Temporal Mastery's suspend trigger, causing you to cast it from exile without paying its mana cost.

Repeat from step 3.

Infinite turns

Lock