Mikaeus, the Unhallowed + Tatterkite + Aether Flash

Mikaeus, the Unhallowed

Tatterkite

Aether Flash

How it works

1. Cast Tatterkite by paying 3.
2. When Tatterkite enters the battlefield, Aether Flash triggers, dealing 2 damage to Tatterkite.
3. Tatterkite dies as a state-based action due to having 0 toughness.
4. Tatterkite's undying ability triggers, returning it to the battlefield from your graveyard with zero +1/+1 counters on it due to its ability.
5. Repeat from step 2.
6. NOTE: This combo creates a mandatory infinite loop that will draw the game if it is not interacted with.

This loop relies on Mikaeus, the Unhallowed granting undying to other non-Human creatures like Tatterkite, whose own ability prevents it from receiving +1/+1 counters. When Tatterkite enters the battlefield, Aether Flash immediately deals 2 damage to it, reducing its toughness to 0 and sending it straight to the graveyard. Because Tatterkite never actually receives the +1/+1 counter from undying, its return to the battlefield triggers Aether Flash all over again, creating an unstoppable and mandatory cycle of life and death.