Drawback 1: Dungeon Descent enters the battlefield tapped
Irencrag Feat can get out a turn 4 Drakuseth all by itself, probably turn 3 if you have any other early ramp, which can dominate the board if your opponents don't have an immediate response
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Ludkins Collectibles wrote a great piece on the Ethics, Morals and Normalization of Pack Weighing that I suggest you give a read
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Sure, you only draw two cards, but the 6/6 or 7/7 you get with a mid-size hand prior to casting is going to be really strong
