Grim Poppet + Hapatra, Vizier of Poisons + Pirated Copy

Grim Poppet

Hapatra, Vizier of Poisons

Pirated Copy

How it works

1. Activate Grim Poppet by removing a -1/-1 counter from it, putting a -1/-1 counter on Pirated Copy.
2. Hapatra triggers, creating a creature token.
3. Activate Pirated Copy 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.

This elegant loop relies on shuffling -1/-1 counters back and forth between Grim Poppet and Pirated Copy to continuously fuel Hapatra, Vizier of Poisons's triggered ability. As each Poppet and Copy removes a counter from itself to place one on the other, Hapatra sees the counters being placed and floods the battlefield with an endless swarm of deathtouch tokens. Pirated Copy doesn't even need its card-drawing ability for this trick to work; simply copying Grim Poppet's nature is enough to keep the counter-passing cycle going indefinitely!