Grim Poppet + Flourishing Defenses + Auton Soldier

Grim Poppet

Flourishing Defenses

Auton Soldier

How it works

1. Activate Grim Poppet by removing a -1/-1 counter from it, putting a -1/-1 counter on Auton Soldier.
2. Flourishing Defenses triggers, creating a creature token.
3. Activate Auton Soldier 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 clever loop turns the mechanical exchange of counters into an endless parade of reinforcements by letting Grim Poppet and Auton Soldier endlessly ping each other back and forth. With Flourishing Defenses sitting on the battlefield, every single time either of those creatures receives a -1/-1 counter, you are rewarded with a fresh 1/1 green Elf Warrior token. Because Grim Poppet starts with its own counters and Auton Soldier easily mirrors the setup (or vice versa), you can bounce the counter between them indefinitely, generating infinite creature ETBs and an unbounded army of tokens.