Gerrard, Weatherlight Hero + Loyal Retainers + Altar of Dementia

Gerrard, Weatherlight Hero

Loyal Retainers

Altar of Dementia

How it works

1. Activate Altar of Dementia by sacrificing Gerrard.
2. Gerrard dies, triggering its ability.
3. Holding priority, activate Loyal Retainers by sacrificing it, returning Gerrard from your graveyard to the battlefield.
4. Resolve the Gerrard trigger, returning all artifact and creature cards put into your graveyard this turn to the battlefield.
5. Resolve the Altar of Dementia ability from step 1, causing target player to mill cards equal to Gerrard's power.
6. Repeat.