Mairsil, the Pretender + Endling + Blood Vassal + Triskelavus

Mairsil, the Pretender

Endling

Blood Vassal

Triskelavus

How it works

1. Activate Mairsil using Endling's third ability by paying , giving Mairsil undying until end of turn.
2. Activate Mairsil using Blood Vassal's ability by sacrificing it, adding .
3. Mairsil dies, triggering its undying ability, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
4. Activate Mairsil using Triskelavus' ability by paying 1 and removing the +1/+1 counter from it, creating a 1/1 Triskelavite artifact creature token.
5. Repeat.
6. Once you have infinite Triskelavite tokens, you may sacrifice them to deal infinite damage to any target(s).