Grim Poppet + Flourishing Defenses + Progenitor Mimic

Grim Poppet

Flourishing Defenses

Progenitor Mimic

How it works

1. Activate Grim Poppet by removing a -1/-1 counter from it, putting a -1/-1 counter on Progenitor Mimic.
2. Flourishing Defenses triggers, creating a creature token.
3. Activate Progenitor Mimic by removing a -1/-1 counter from it, putting a -1/-1 counter on Grim Poppet.
4. Flourishing Defenses triggers, creating a creature token.
5. Repeat.

This elegant loop transforms the counter-shifting abilities of Grim Poppet and a copied Progenitor Mimic into a self-sustaining engine. Because Progenitor Mimic enters the battlefield as a copy of Grim Poppet, both creatures can strip -1/-1 counters off each other back and forth indefinitely. Meanwhile, Flourishing Defenses watches these counters being placed and rewards you with an endless army of Elf Warrior tokens every single time the process repeats.