Gerrard, Weatherlight Hero + Molten Echoes + Altar of Dementia

Gerrard, Weatherlight Hero

Molten Echoes

Altar of Dementia

How it works

1. Cast Gerrard either from your graveyard or from the command zone by paying 2 and commander tax, if applicable.
2. Gerrard enters the battlefield, triggering Molten Echoes, creating a token copy of Gerrard with haste.
3. Put the nontoken Gerrard into your graveyard due to the legend rule.
4. The nontoken Gerrard dies, triggering its ability.
5. Holding priority, activate Altar of Dementia by sacrificing the token Gerrard.
6. The token Gerrard dies, exiling itself and returning the nontoken Gerrard from your graveyard to the battlefield.
7. Repeat from step 2 an arbitrarily large number of times.
8. Resolve all Altar of Dementia abilities, causing any number of players to mill infinite cards.