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The back face of a transforming double-faced card can't be cast unless an effect allows you to cast it "transformed." (See the "Returning Mechanic: Disturb" section of this document.) A transforming double-faced card enters the battlefield with its front face up by default, unless a spell or ability instructs you to put it onto the battlefield transformed or you cast it transformed, in which case it enters with its back face up

You have very limited space for such cards and you can get a lot more power than this with most of the others on this list

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You can, in the right decks, double the strength and defence of your entire battlefield presence for just five mana