Incubate is a new keyword action that allows you, yes you, blessed spreader of Elesh Norn's perfection, to create Incubator tokens
Meme-worthiness aside, theres quite a bit going on with Kibo
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That means you can afford to splash out a little bit more in black for cards that provide options and won't ever be dead weight in hand (obviously once you can cast it, everything with a cost can be dead when you can't pay it...)
By the way, similar cards already existed with Truce and Temporary Truce, which got a lot of multiplayer play during their heyday - although there you could trade cards drawn for life gain if you were about to die and needed to come back
Black doesnt care, though