Yenna, Redtooth Regent + Siona, Captain of the Pyleas + Ashnod's Altar

Yenna, Redtooth Regent

Siona, Captain of the Pyleas

Ashnod's Altar

How it works

1. Activate Yenna by paying 2 and tapping it, creating a token copy of any Aura you control attached to any other creature you control, then causing you to untap Yenna and scry 2.
2. Siona's second ability triggers, creating a 1/1 Human Soldier creature token.
3. Activate Ashnod's Altar by sacrificing the creature that has the Aura token attached to it, adding CC.
4. Repeat.

This delightful loop revolves around the synergy between Yenna, Redtooth Regent and Siona, Captain of the Pyleas, using any initial Aura to get things started. As Yenna continuously duplicates that Aura, Siona's triggered ability rewards each attachment by churning out a fresh 1/1 Human Soldier creature token. You can then feed those newly minted tokens directly into Ashnod's Altar to harvest the colorless mana needed to repeatedly pay Yenna's activation cost. The beauty of the system is that whenever Yenna copies an Aura, her own ability untaps her, while the resulting token triggers Siona's creation loop and provides the sacrifice fuel for the Altar.