At the beginning of the end step, if you control four or more creatures named Biovisionary, you win the game.
If the ability does trigger, but you don’t control four or more creatures named Biovisionary when the ability tries to resolve, the ability will do nothing.
If you don’t control four or more creatures named Biovisionary at the beginning of the end step, the ability won’t trigger.
Token creatures that are a copy of Biovisionary will count.