Biovisionary + Finale of Promise + Twinflame

Biovisionary

Finale of Promise

Twinflame

How it works

1. Cast Finale of Promise by paying 10, causing you to cast Twinflame from your graveyard without paying its mana cost and copying it twice, with all spells targeting Biovisionary.
2. Resolve all Twinflames, creating three token copies of Biovisionary.
3. At the beginning of your end step, each Biovisionary you control triggers, and Twinflame triggers three times.
4. Resolve the first Biovisionary trigger, causing you to win the game.

This clever setup hinges on a massive Finale of Promise, fueled with enough mana to reach $X=10$ so it can copy its spells twice. By targeting a single Twinflame in your graveyard, the Finale triggers three times in total, allowing you to multiply your creatures in a single burst. You point those copies at your original Biovisionary to flood the battlefield with the exact quorum needed. When your turn advances, the combined presence of four creatures named Biovisionary satisfies the win condition before the temporary tokens can be exiled.