The same thing can be done with Murderous Redcap for infinite damage or even Glen Elendra Archmage for infinite Negates
#21 The issue is that a lot of control decks want to run sweepers as part of their many for one strategies, and you don't ideally want to be running out 2/1, 1/3, 0/4, or 0/5 bodies that don't net a card turns 2-3 when you are hoping to wipe the board in some capacity turns 4-6
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If youre into backgrounds, then Passionate Archaeologist is a must-have as itll deal damage based on an exiled spell's mana value to any opponent
But in this case, we get an additional +1/+1 on the body, we get to untap her whenever we cast a legendary spell, allowing us to use it again, and the flip side is the unholy union of Phyrexian Obliterator and Mindleech Mass