At 3 mana, and 4 mana to activate, this isnt too bad as far as cost goes
The one aura that I almost never board out is Madcap Skills, because it deals the most damage and gives you a quasi-evasive ability against good blockers like Blood Baron of Vizkopa and Desecration Demon
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Things have changed the more my friends have peeled off of it, leaving me playing a soul-crushing collect-a-thon where the luck of the draw is rarely in my favor
Pile shuffling has several additional benefits as well: It runs less of a risk of the player accidentally seeing a card or dropping a card face up, since they can be held with the faces pointing straight downwards, unlike mash shuffling where that would be an extremely awkward position for one's hands
As such, having a creature that can block over and over again and successfully dissuade all attacks can make a tremendous difference