Biovisionary + Complete the Circuit + Croaking Counterpart

Biovisionary

Complete the Circuit

Croaking Counterpart

How it works

1. Cast Complete the Circuit by paying 5, causing you to copy the next instant or sorcery spell you cast twice.
2. Cast Croaking Counterpart by paying 1, targeting Biovisionary.
3. Complete the Circuit triggers, copying Croaking Counterpart twice, with both copies targeting Biovisionary.
4. Resolve all Croaking Counterparts, creating three token copies of Biovisionary that are 1/1 Frogs.
5. At the beginning of your end step, each Biovisionary triggers.
6. Resolve the first trigger, causing you to win the game.