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

Sin, Unending Cataclysm

Aura of Dominion

Phyrexian 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 Phyrexian Altar by sacrificing Sin, adding G/U.
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 intricate loop turns the cyclical rebirth of Sin, Unending Cataclysm into an engine for infinite mana and astronomical power. By orchestrating Sin's death with Phyrexian Altar, you can repeatedly send it back to the command zone while triggering its death ability to pile its massive stack of +1/+1 counters onto Heronblade Elite. Those accumulated counters supercharge Heronblade Elite's tap ability to generate a deluge of green or blue mana, which in turn fuels Aura of Dominion to untap Heronblade Elite using Sin as the tapped creature. Together, these pieces establish a relentless feedback loop that continuously pumps Heronblade Elite while flooding your mana pool.