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Its Rotating Claws attack is pretty clever: you discard an Energy from Charizard, then grab one from your discard pile and reattach it

Cards that do something and draw you a card, whether that's a combat trick, letting you scry, or summoning a 1/1 creature, are effectively free, so while they may not be impressive, they're never a bad thing to include in your deck

it helps me figure out when its worth grabbing certain splashable cards or off-color fixing lands

That seems like the worst Secret Lair bonus card to open, but for all we know, it could be the rarest one.

Your foes dont know whats what underneath your cards, and you use that to your advantage through the game

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