2: Ouroboroid This cards made to scale and in the right deck, it can get out of hand fast
That said, it'll most often be your own creature targeted with this spell, as you can't control what critters your opponents play, but you can play out your own in such a way to get the biggest benefit
And if you can get infinite mana, which shouldnt be an issue in Jeskai, you can have two players draw their entire libraries at once
Then, it starts drawing you cards every single turn, and the cost is a bit of life that increases over time
However, green cards can also have it, usually as a secondary perk, and there are a handful of blues that also use it
Anguished Unmaking Destroying a threat is good, but exiling a target is better: Those pesky death triggers won't trigger (because exiling ain't dying!), and most decks have no way to profit from exiled cards (unlike cards in the graveyard, which some decks are thrilled to have)