Mairsil, the Pretender + Endling + Blood Vassal + Crystalline Crawler

Prerequisites

• Mairsil does not have a +1/+1 counter on it.

Steps

1. 1Activate Mairsil using Endling's third ability by paying , giving Mairsil undying until end of turn.
2. 2Activate Mairsil using Blood Vassal's ability by sacrificing it, adding .
3. 3Mairsil dies, triggering its undying ability, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
4. 4Activate Mairsil using Crystalline Crawler's first ability by removing a +1/+1 counter from it, adding one mana of any color.
5. 5Repeat.

Effects

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