Mayael's Aria + Chameleon Colossus

Mayael's Aria

Chameleon Colossus

How it works

1. At the beginning of your upkeep, Mayael's Aria triggers.
2. Holding priority, activate Chameleon Colossus by paying 2, causing it to get +X/+X until end of turn, where X is its power.
3. Repeat step 2 until Chameleon Colossus has power 20 or greater.
4. Resolve the Mayael's Aria trigger, causing you to put a +1/+1 counter on each creature you control, gain 10 life and win the game.