Sin, Unending Cataclysm + Aura of Dominion + Altar of Dementia + Heronblade Elite

Sin, Unending Cataclysm

Aura of Dominion

Altar of Dementia

Heronblade Elite

How it works

1. Cast Sin either from your hand or command zone by paying 5 plus commander tax if applicable.
2. As Sin enters, remove all counters from all artifacts, enchantments and creatures you control, putting twice that many +1/+1 counters on Sin.
3. Activate Aura of Dominion by paying 1 and tapping Sin, untapping Heronblade Elite.
4. Activate Altar of Dementia by sacrificing Sin.
5. Choose to return Sin to the command zone from your graveyard.
6. When Sin dies, it triggers, putting its counters on Heronblade Elite.
7. Resolve the Altar of Dementia ability.
8. Activate Heronblade Elite by tapping it, adding an amount of or equal to its power.
9. Repeat.

This marvelous loop lets you repeatedly cast and sacrifice Sin, Unending Cataclysm to achieve infinite mill and mana, all while funneling its massive power growth into the rest of your board. By enchanting Heronblade Elite with Aura of Dominion, you unlock an engine that turns the Elite's massive power—steadily boosted each time Sin enters the battlefield—into the exact mana needed to pay Aura of Dominion's activation cost and recast your commander. Finally, Altar of Dementia transforms Sin's endless sacrifices into a devastating mill condition, milling out your opponents while feeding the cycle anew from the command zone.