Biovisionary + Storm King's Thunder + Cackling Counterpart

Biovisionary

Storm King's Thunder

Cackling Counterpart

How it works

1. Cast Storm King's Thunder by paying 2, copying the next instant or sorcery spell you cast twice.
2. Cast Cackling Counterpart by paying 1, targeting Biovisionary.
3. Storm King's Thunder triggers, copying Cackling Counterpart twice, with both copies targeting Biovisionary.
4. Resolve all Cackling Counterparts, creating three token copies of Biovisionary.
5. At the beginning of your end step, each Biovisionary triggers.
6. Resolve the first trigger, causing you to win the game.