Cast Saw in Half by paying ({2} magic symbol) ({B} magic symbol) , destroying Verdurous Gearhulk and creating two 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, as well as two 1/1 Squirrel creature tokens.
When the Verdurous Gearhulk tokens enter the battlefield, they trigger, putting eight +1/+1 counters on Nested Shambler.
Kill Nested Shambler, triggering its ability, creating at least 18 1/1 Squirrel creature tokens.
At the beginning of your next upkeep, Epic Struggle triggers, causing you to win the game.
Results
Win the game at the beginning of your next upkeep.