Basri's Lieutenant + Cathars' Crusade + Altar of Dementia

Prerequisites

• You control at least one additional creature with at least one +1/+1 counter.

Steps

1. 1Activate Altar of Dementia by sacrificing a creature with at least one +1/+1 counter.
2. 2Basri's Lieutenant trigger, creating a 2/2 Knight token.
3. 3When Knight token enters the battlefield, Cathars' Crusade triggers, putting a +1/+1 counter on each creature you control.
4. 4Resolve the Altar of Dementia ability, causing target player to mill cards equal to the sacrificed creature's power.
5. 5Repeat.

Effects

• Infinite +1/+1 counters on creatures you control
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite mill
• Infinite sacrifice triggers