Malcolm, Keen-Eyed Navigator + Magmaw + Amoeboid Changeling + Quina, Qu Gourmet

Malcolm, Keen-Eyed Navigator

Magmaw

Amoeboid Changeling

Quina, Qu Gourmet

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 a 1/1 Frog creature token and a Treasure token.
4. Activate a Treasure by tapping and sacrificing it, adding 1.
5. Repeat from step 2.

This clever loop transforms Magmaw into a literal Pirate by utilizing Amoeboid Changeling's ability to grant all creature types, allowing its own sacrifice activation to deal damage that triggers Malcolm, Keen-Eyed Navigator. Thanks to Quina, Qu Gourmet's static replacement effect, every time Malcolm generates a Treasure token, it also produces an extra 1/1 green Frog creature token. You can then sacrifice that newly created Frog to feed Magmaw's activation cost and repeat the process, turning a cascade of artifact and creature tokens into an endless storm of damage.