- All permanents on the battlefield.
- Sovereign Okinec Ahau does not have summoning sickness.
- Declare Sovereign Okinec Ahau as an attacker.
- Sovereign Okinec Ahau triggers, putting twenty +1/+1 counters on the creature that has Colossification attached.
- Simic Ascendancy's first ability triggers, putting 20 growth counters on it.
- At the beginning of your next upkeep, Simic Ascendancy's second ability triggers, causing you to win the game.
- Win the game at the beginning of your next upkeep.