Grim Poppet + Hapatra, Vizier of Poisons + Progenitor Mimic

Grim Poppet

Hapatra, Vizier of Poisons

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. Hapatra 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. Hapatra triggers, creating a creature token.
5. Repeat.