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In particular, these creatures allow you to play to the board while developing your mana at the same time - many other designs (such as tapped lands) only make mana and you tend to fall behind in order to fix your mana. Preorder MTG Tarkir: Dragonstorm Cards Senior Worldbuilding Designer Lauren Bond says that while that mechanical side came first with this particular cycle, the team often relies on common cards as a place to showcase the world of a set - in this case, how these clans are different from the last time players saw them

Our first two spoilers for the day are technically spoilers from last night

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These are stepped cards that provide greater benefits as you complete more of their criteria