Grim Poppet + Hapatra, Vizier of Poisons + Phyrexian Metamorph

Grim Poppet

Hapatra, Vizier of Poisons

Phyrexian Metamorph

How it works

1. Activate Grim Poppet by removing a -1/-1 counter from it, putting a -1/-1 counter on Phyrexian Metamorph.
2. Hapatra triggers, creating a creature token.
3. Activate Phyrexian Metamorph 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 clever loop relies on trading counters back and forth between Grim Poppet and Phyrexian Metamorph to repeatedly trigger Hapatra, Vizier of Poisons. By stripping and reapplying -1/-1 counters between the two creatures, you continuously satisfy Hapatra's static triggered ability, flooding the board with an endless horde of deathtouch Snake tokens and entering-the-battlefield triggers.