Yenna, Redtooth Regent + Ashnod's Altar + Secret Arcade // Dusty Parlor + Breaching Hippocamp

Yenna, Redtooth Regent

Ashnod's Altar

Secret Arcade // Dusty Parlor

Breaching Hippocamp

How it works

1. Activate Yenna by paying 2 and tapping it, creating a token copy of Breaching Hippocamp.
2. When the Breaching Hippocamp token enters, it triggers, untapping Yenna.
3. Activate Ashnod's Altar by sacrificing the Breaching Hippocamp token, adding CC.
4. Repeat.

This clever loop relies on Secret Arcade // Dusty Parlor to turn all your nonland permanents into enchantments, allowing Yenna, Redtooth Regent to target and copy any nonland permanent you control—in this case, transforming into a factory for Breaching Hippocamp tokens. Each time a token hits the board, its enter-the-battlefield trigger untaps Yenna so she can get back to work. Feeding those fresh tokens right into Ashnod's Altar yields the exact colorless mana needed to repeatedly pay Yenna's activation cost and keep the chain of leaps going indefinitely.