Yenna, Redtooth Regent + Peregrin Took + Krark-Clan Ironworks + Thaumatog

Yenna, Redtooth Regent

Peregrin Took

Krark-Clan Ironworks

Thaumatog

How it works

1. Activate Yenna by paying 2 and tapping it, creating a token copy of an Aura you control and a Food artifact token, then untapping Yenna and causing you to scry 2.
2. Activate Krark-Clan Ironworks by sacrificing the Food, adding CC.
3. Activate Thaumatog's second ability by sacrificing the Aura token, giving Thaumatog +1/+1 until end of turn.
4. Repeat.

This clever loop relies on Yenna, Redtooth Regent to continually churn out copies of an Aura you control, which concurrently triggers Peregrin Took to replace each creation with both the Aura token and an extra Food token. While Thaumatog serves as a sacrificial outlet that grows infinitely larger by consuming the Aura tokens for its +1/+1 buff, Krark-Clan Ironworks turns the generated Food tokens into the precise generic mana needed to pay for Yenna's activation cost. Because the Aura token counts as an enchantment, sacrificing it to Thaumatog clears the board for the next iteration while Yenna's untap ability—fueled by the Aura copying process—keeps the engine running for infinite scrying and a devastatingly massive creature.