Grim Poppet + Nest of Scarabs + Mercurial Pretender

Grim Poppet

Nest of Scarabs

Mercurial Pretender

How it works

1. Activate Grim Poppet by removing a -1/-1 counter from it, putting a -1/-1 counter on Mercurial Pretender.
2. Nest of Scarabs triggers, creating a creature token.
3. Activate Mercurial Pretender by removing a -1/-1 counter from it, putting a -1/-1 counter on Grim Poppet.
4. Nest of Scarabs triggers, creating a creature token.
5. Repeat.

This clever loop relies on a clever bit of identity-swapping to set up an endless engine of decay and rebirth. By having Mercurial Pretender enter the battlefield as a copy of Grim Poppet, you gain a second source capable of shifting -1/-1 counters back and forth. Every time Grim Poppet or your copied Grim Poppet strips a counter to fuel this internal transfer, Nest of Scarabs watches the counter land and instantly rewards you with a 1/1 black Insect creature token. Because you can pass the counter endlessly between the two Poppets, you generate an infinite stream of creature enters-the-battlefield triggers and an army of crawling tokens.