Mairsil, the Pretender, Endling, Blood Vassal, and Triskelavus

Prerequisites

• Mairsil, the Pretender on the battlefield
• Endling in exile
• Blood Vassal in exile
• Triskelavus in exile
• Mairsil does not have a +1/+1 counter on it
• available

Steps

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 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)

Results

• Infinite creature tokens
• Infinite damage
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers