On the end step prior to your turn, cast Saw in Half by paying ({2} magic symbol) ({B} magic symbol) , destroying Myr Battlesphere 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.
The Myr Battlesphere tokens enter the battlefield, creating thirty-two 1/1 Myr artifact creature tokens.
At the beginning of your next upkeep, Hellkite Tyrant triggers, causing you to win the game.
Results
Near-infinite creature tokens.
Near-infinite ETB.
Win the game at the beginning of your next upkeep.