Malcolm, Keen-Eyed Navigator + Magmaw + Amoeboid Changeling + Primal Vigor

Malcolm, Keen-Eyed Navigator

Magmaw

Amoeboid Changeling

Primal Vigor

How it works

1. Activate Amoeboid Changeling by tapping it, causing Magmaw to gain all creature types until end of turn.
2. Activate Magmaw by paying 1 and sacrificing another nonland permanent, dealing 1 damage to an opponent.
3. Malcolm triggers, creating two Treasure tokens.
4. Activate a Treasure by tapping and sacrificing it, adding 1.
5. Repeat from step 2.

Amoeboid Changeling plays a clever trick here by turning Magmaw into a Pirate, allowing its ability-fueled damage to trigger Malcolm, Keen-Eyed Navigator whenever it pings an opponent. Because Primal Vigor doubles every token that enters the battlefield, each successful ping produces a surplus of wealth instead of a simple one-for-one exchange. You can then sacrifice those generated tokens to feed Magmaw's activation cost, creating a perpetual loop that converts disposable permanents into infinite damage.