Hightide Hermit
A wall that pays for the right to stop being one. The body comes down as a defensive 4/4, but it arrives already holding the resource it needs to break its own rules: the four energy on entry funds two attacks, and after that the crab is back behind the line unless you have stockpiled more. That is the clever part of the design. Most energy producers hand you a generic battery to spend elsewhere; this one bundles its fuel and its outlet into a single creature, so it reads as a self-contained engine rather than a card asking for support. The tension is in the math. Defender on a 4/4 means it blocks well for the cost without ever being a liability, and the energy clause turns it into an intermittent beater that you choose to switch on, turn by turn, rather than a wall that hopes to be relevant. The wider an energy deck's surplus, the more often the hermit gets to charge the front line, which quietly aligns it with every other energy source you run. Left to its own devices it gives you exactly two swings and then settles back to blocking, which is the honest baseline a deck builds upward from.

