2013-01-24 : 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.

2013-01-24 : If you don’t control four or more creatures named Biovisionary at the beginning of the end step, the ability won’t trigger.

2013-01-24 : Token creatures that are a copy of Biovisionary will count.