Biovisionary + Mnemonic Deluge + Croaking Counterpart

Biovisionary

Mnemonic Deluge

Croaking Counterpart

How it works

1. Cast Mnemonic Deluge by paying 6, exiling Croaking Counterpart and casting three copies of it without paying their mana costs.
2. Resolve the three Croaking Counterpart copies, creating three token copies of Biovisionary.
3. At the beginning of your end step, each Biovisionary you control triggers.
4. Resolve the first trigger, causing you to win the game.