Biovisionary + Echo Mage + Cackling Counterpart

Biovisionary

Echo Mage

Cackling Counterpart

How it works

1. Cast Cackling Counterpart by paying its mana cost, targeting Biovisionary.
2. Holding priority, activate Echo Mage by tapping it, copying Cackling Counterpart twice, with both copies targeting Biovisionary.
3. Resolve all Cackling 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.

This clever loop leverages the explosive spell-copying power of Echo Mage at Level 4+ to instantly multiply your win condition. By targeting an initial cast of Cackling Counterpart with the Mage's newly upgraded ability, you flood the board with the required clones. This effortlessly satisfies Biovisionary's alternate win condition as soon as your end step arrives, turning a single creature into an unanswerable swarm of four.