Control Magic is a powerful card in Commander already, and New Blood is a strict upgrade (since it's not an enchantment sitting on the battlefield to be killed or waiting for the creature to be blinked) if you're playing a Vampire deck
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You can really tear up a hand in Premodern if youre on the play with black by, say, turn one Dark Ritual into Cabal Therapy, then playing a two-drop creature, say, Ravenous Rats (making them discard a card), and then flashback Cabal and sac Rats, then Unmask paying the alt cost of discarding a black card
Players can simply insert Mew ex into their decks and deploy it if coming up against a Mewtwo ex, removing its previously straightforward means of victory and, at the very least, allowing for a more dynamic match
To tie it all together, having a 6/6 haste beater isn't the worst either