Cast Saw in Half by paying 2, destroying Verdurous Gearhulk and creating four token copies of it with base power equal to half the destroyed creature's power and base toughness equal to half the destroyed creature's toughness, rounding up each time.
When the Verdurous Gearhulk tokens enter the battlefield, they trigger, putting sixteen +1/+1 counters on a creature you control with power 3 or greater.
At the beginning of your next upkeep, Mayael's Aria triggers, causing you to put a +1/+1 counter on each creature you control, gain 10 life and win the game.