Ulasht, the Hate Seed + Agatha's Soul Cauldron + Wildwood Mentor + Utopia Mycon

Ulasht, the Hate Seed

Agatha's Soul Cauldron

Wildwood Mentor

Utopia Mycon

How it works

1. Activate Wildwood Mentor using Ulasht's ability by paying 1 and removing a +1/+1 counter from it, creating a 1/1 Saproling creature token.
2. When the Saproling enters the battlefield, Wildwood Mentor's first ability triggers, putting a +1/+1 counter on itself.
3. Activate Utopia Mycon's second ability by sacrificing the Saproling, adding 1.
4. Repeat.

This loop turns Ulasht, the Hate Seed into a mana-positive token engine by feeding its activated ability through Agatha's Soul Cauldron. Because the Cauldron grants Ulasht's ability to the board, you can spend mana to churn out 1/1 green Saproling tokens—which Utopia Mycon promptly converts back into mana by sacrificing them. Meanwhile, Wildwood Mentor watches these tokens enter the battlefield to continuously grow its own power, feeding right back into the engine's momentum.