At the beginning of your upkeep, Mayael's Aria triggers.
Holding priority, activate Colossus of Akros by paying {10}, putting ten +1/+1 counters on it and causing it to become monstrous.
Resolve the Mayael's Aria trigger, causing you to put a +1/+1 counter on each creature you control, gain ten life, and win the game.

Win the game at the beginning of your next upkeep

Mayael's Aria

Colossus of Akros

Activate Colossus of Akros by paying {10}, putting twenty +1/+1 counters on it and causing it to become monstrous.
Simic Ascendancy triggers, putting twenty growth counters on itself.
At the beginning of your upkeep, Simic Ascendancy triggers, causing you to win the game.

Simic Ascendancy

Branching Evolution

Activate Colossus of Akros by paying {10}, putting twenty +1/+1 counters on it and causing it to become monstrous.
Simic Ascendancy triggers, putting forty growth counters on itself.
At the beginning of your upkeep, Simic Ascendancy triggers, causing you to win the game.

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