With so few ways to do that in Magic, it is a fairly reliable strategy
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You can also pay 4 mana to discard K&Y to destroy an artifact or enchantment, but the cherry on top is that you still get your discard payoffs before shuffling the card back into your library
Iconic character
The mill ability is not the greatest, it has no evasion, and Id hate to pay seven mana to make my opponent discard one card if they have three in hand
You may exile all other creatures