It's already the top-selling Magic: The Gathering set in history
You get the full benefit of haste either way
I say mostly because well, sometimes gaining control of a spell won't help you but this will be the only counter in your hand and you'll be desperately hoping to lose the flip
(And, full disclosure, is only my second favorite of the new Ultimatums.) Part Gifts Ungiven, part Mind's Desire, part Demonic Tutor, Emergent Ultimatum, like those powerful predecessors, isn't the endgame in and of itselfbut it might as well be
You do this again on his next turn and then you ultimate on the following turn
This fits in with black's willingness to take risks for a big reward