Summon: G.F. Cerberus + Biovisionary + Cackling Counterpart

Summon: G.F. Cerberus

Biovisionary

Cackling Counterpart

How it works

1. At the beginning of your precombat main phase. Summon: G.F. Cerberus triggers, putting a lore counter on it and triggering its third chapter ability, copying the next instant or sorcery spell you cast twice.
2. Cast Cackling Counterpart by paying its mana cost, targeting Biovisionary.
3. Summon: G.F. Cerberus triggers, copying Cackling Counterpart twice, with the copies targeting Biovisionary.
4. Resolve all Cackling Counterparts, copying Biovisionary three times.
5. At the beginning of your end step, each Biovisionary triggers. Resolve the first trigger, causing you to win the game.

By leveraging chapter III of Summon: G.F. Cerberus, you set up a single spell to multiply wildly and instantly fulfill an alternate win condition. When you cast Cackling Counterpart to make a copy of Biovisionary, the Saga's triggered ability steps in to copy that spell twice, yielding three total spell resolutions. This instantly floods the battlefield with four copies of Biovisionary, meeting the creature's exact threshold so that its end-step trigger wins you the game right then and there.