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Paired with cards like Ankh of Mishra or Dingus Staff, Dariens ability can get out of hand quickly

It reminds me of the choice players had to make with Attune with Aether where you need to get the right basic (Yes, I know the energy decks from Kaladesh were busted), especially in the 4C Energy deck

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Its as big as your hand, which is a good reason to run infinite hand size cards

I'm a huge fan of forcing opponents to block