Sin, Unending Cataclysm + Aura of Dominion + Ashnod's Altar + Heronblade Elite

Sin, Unending Cataclysm

Aura of Dominion

Ashnod's Altar

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 Ashnod's Altar by sacrificing Sin, adding CC.
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. Activate Heronblade Elite by tapping it, adding an amount of or equal to its power.
8. Repeat.

This fascinating loop centers on Sin, Unending Cataclysm, which enters the battlefield stripping counters from your permanents to grow massive, then happily heads back to the command zone upon death to be cast over and over. Each time Sin dies, its massive stockpile of counters is funneled onto Heronblade Elite via Sin's own triggered ability, exponentially inflating the Elite's power. That towering power is then tapped into using Heronblade Elite's mana ability, providing the colored mana needed to fund Aura of Dominion's untap cost while Ashnod's Altar converts Sin into the colorless mana required to recast your commander.