Mairsil, the Pretender + Endling + Cauldron of Souls + Blood Vassal + Thousand-Year Elixir

Prerequisites

—

Steps

1. 1Activate Mairsil using Cauldron of Souls' ability by tapping it, giving itself persist until end of turn.
2. 2Activate Mairsil using Blood Vassal's ability by sacrificing it, adding .
3. 3When Mairsil dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
4. 4Activate Mairsil using Endling's third ability by paying , giving Mairsil undying until end of turn.
5. 5Activate Mairsil using Blood Vassal's ability by sacrificing it, adding .
6. 6When Mairsil dies, its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
7. 7Repeat.

Effects

• Infinite black mana
• Infinite creature ETB
• Infinite creature LTB
• Infinite creature sacrifice triggers
• Infinite death triggers