Biovisionary + Echo Mage + Multiversal Incursion

Biovisionary

Echo Mage

Multiversal Incursion

How it works

1. Cast Multiversal Incursion by paying its mana cost
2. Holding priority, activate Echo Mage by tapping it, copying Multiversal Incursion twice
3. Resolve all Multiversal Incursion 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.

By leveraging Echo Mage fully leveled up to level 4+, you gain the ability to copy a spell twice simply by tapping it. When you cast Multiversal Incursion, holding priority and copying it twice allows you to resolve multiple instances of the spell, which multiplies your token-creation output for each nontoken creature you control thanks to its token-copying effect. This sudden influx easily pushes your numbers to four or more identical creatures, setting up Biovisionary's condition to trigger right at the beginning of your end step and immediately win you the game.