Impostor Syndrome + Fear of Missing Out + Hammer of Purphoros

Impostor Syndrome

Fear of Missing Out

Hammer of Purphoros

How it works

1. Declare Fear of Missing Out as an attacker, triggering its ability, causing you to untap it and to get an additional combat phase after this one.
2. Deal combat damage to an opponent using Fear of Missing Out, triggering Impostor Syndrome, creating a token copy of Fear of Missing Out that isn't legendary.
3. When the Fear of Missing Out token enters, it triggers, causing you to rummage
4. During your next combat phase, declare Fear of Missing Out and the Fear of Missing Out token as attackers.
5. The Fear of Missing Out token triggers, causing you to untap the nontoken Fear of Missing Out and to get an additional combat phase after this one.
6. Repeat from step 2.

This loop relies on Impostor Syndrome turning the combat damage of Fear of Missing Out into a relentless stream of nonlegendary token copies. Each fresh copy triggers its own entry to rummage through your library while Hammer of Purphoros grants the entire swarm immediate haste, allowing them to pile into combat the very same turn they arrive. Because each attacking copy of Fear of Missing Out triggers its own extra combat phase and untaps your creatures, you can continuously chain additional attacks to multiply your token army exponentially.