Malcolm, Keen-Eyed Navigator + Havoc Jester + Amoeboid Changeling

Malcolm, Keen-Eyed Navigator

Havoc Jester

Amoeboid Changeling

How it works

1. Activate Amoeboid Changeling's first ability by tapping it, causing Havoc Jester to gain all creature types until end of turn.
2. Activate a Treasure token by tapping and sacrificing it, adding one mana of any color.
3. Havoc Jester triggers, dealing 1 damage to any opponent.
4. Malcolm triggers, creating a Treasure token.
5. Repeat from step 2.