Biovisionary + Echo Mage + Croaking Counterpart

Biovisionary

Echo Mage

Croaking Counterpart

How it works

1. Cast Croaking Counterpart by paying its mana cost, targeting Biovisionary.
2. Holding priority, activate Echo Mage by tapping it, copying Croaking Counterpart twice, with both copies targeting Biovisionary.
3. Resolve all Croaking Counterpart spells, creating three token copies of Biovisionary.
4. At the beginning of your end step, each Biovisionary triggers. Resolve the first trigger, causing you to win the game.