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Modern black spells in MTG rarely get this kind of efficiency

it lets you cast your Archaeomancer or Mycosynth Wellspring a second time while it also creates a 2/3 flying body for just 2 mana

Instead, he had to make due with a slightly less extreme set of threats, most of which were designed to be especially good at beating whatever the opponents best threat was (given the nature of Hypergenesis letting them play their best threat for free)

One, it made it clear who you could and couldn't use the enchantment on, and two, it allowed you to use a Flight effect (something that grants a creature flying) to break them free from the enchantment (if the creature gains flying, the aura falls off as it can only enchant a creature without flying)