Cast Complete the Circuit by paying {5}{U}, copying the next instant or sorcery spell you cast twice.
Cast Biovisionary by paying {1}{G}{U}.
Holding priority, cast Double Major by paying {G}{U}, targeting Biovisionary.
Complete the Circuit triggers, copying Double Major twice, with both copies targeting Biovisionary.
Resolve all Double Majors, creating three copies of the Biovisionary spells.
Resolve all Biovisionary spells, causing you to have a nontoken Biovisionary and three token Biovisionaries.
At the beginning of your end step, each Biovisionary triggers.
Resolve the first trigger, causing you to win the game.

Win the game

Infinite magecraft triggers

Biovisionary

Complete the Circuit

Double Major

Cast Complete the Circuit by paying {5}{U}, causing you to copy the next instant or sorcery spell you cast twice.
Cast Cackling Counterpart by paying {1}{U}{U}, targeting Biovisionary.
Complete the Circuit triggers, copying Cackling Counterpart twice, with both copies targeting Biovisionary.
Resolve all Cackling Counterparts, creating three token copies of Biovisionary.
At the beginning of your end step, each Biovisionary triggers.
Resolve the first trigger, causing you to win the game.

Cackling Counterpart

Cast Complete the Circuit by paying {5}{U}, causing you to copy the next instant or sorcery spell you cast twice.
Cast Quasiduplicate by paying {1}{U}{U}, targeting Biovisionary.
Complete the Circuit triggers, copying Quasiduplicate twice, with both copies targeting Biovisionary.
Resolve all Quasiduplicates, creating three token copies of Biovisionary.
At the beginning of your end step, each Biovisionary triggers.
Resolve the first trigger, causing you to win the game.

Quasiduplicate

Cast Complete the Circuit by paying {5}{U}, causing you to copy the next instant or sorcery spell you cast twice.
Cast Croaking Counterpart by paying {1}{G}{U}, targeting Biovisionary.
Complete the Circuit triggers, copying Croaking Counterpart twice, with both copies targeting Biovisionary.
Resolve all Croaking Counterparts, creating three token copies of Biovisionary that are 1/1 Frogs.
At the beginning of your end step, each Biovisionary triggers.
Resolve the first trigger, causing you to win the game.

Combos with "Complete the Circuit"