Unfortunately, there aren't quite enough potential triggers of paradox to make this strategy effective
That's easy to pay in the later game, but in earlier turns, opponents won't often have a spare mana to prevent that card draw
While we already knew that Bruce Banner would feature on a double-sided card, we hadn't yet seen how powerful The Incredible Hulk would be, only that he would cost a beefy six mana
Still, for those of a nostalgic bent, the original untouchable Angel is worth a look
Whereas with The Meathook Massacre, I dont think this is an auto-include in all black decks
If you can copy it, it kind of becomes worth the mana investment, except you could just play a card that was worth what you're paying in the first place, and copy that