Mairsil, the Pretender + Endling + Blood Vassal + Walking Ballista

Prerequisites

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Steps

1. 1Activate Mairsil using Endling's third ability by paying , gaining Mairsil undying.
2. 2Activate Mairsil using Blood Vassal's ability by sacrificing it, adding .
3. 3Mairsil undying triggers, returning it to the battlefield with a +1/+1 counter.
4. 4Activate Mairsil using Walking Ballista's last ability by removing a +1/+1 counter, dealing 1 damage to any target.
5. 5Repeat.

Effects

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