Chainer, Dementia Master + K'rrik, Son of Yawgmoth + Gray Merchant of Asphodel + Dimir House Guard

Prerequisites

• Your life total is at least ten.
• Your devotion to black is at least ten or you have at least two opponents.

Steps

1. 1Activate Dimir House Guard by sacrificing Gray Merchant, regenerating it the next time it would die this turn.
2. 2Activate Chainer by paying nine life, returning Gray Merchant from your graveyard to the battlefield as a Nightmare in addition to its other creature types.
3. 3Gray Merchant enters the battlefield, causing each opponent to lose life equal to your devotion to black and causing you to gain life equal to the amount of life lost this way.
4. 4Repeat.

Effects

• Infinite death triggers
• Infinite ETB
• Infinite lifegain
• Infinite lifegain triggers
• Infinite lifeloss
• Infinite LTB
• Infinite sacrifice triggers
• Return all creature cards from all graveyards to the battlefield under your control