Aetherstorm Roc

Energy as a mechanic asked a deceptively hard question: how do you reward a deck for doing what it was already going to do, then let it cash that reward in without bending the curve? Most energy payoffs answered by being engines that need a separate sink. This one is both halves at once. The trigger fires on any creature you control entering, including itself, so a board that develops naturally bankrolls the attack. The payoff folds growth and tempo into a single combat decision: pay two energy on the swing, grow permanently, and tap a blocker before damage is assigned. That last clause is the part doing the real work, because it is not a removal spell or an evasion grant but a way to manufacture a clean hit out of a stalled board, turning energy stockpiled passively into an unblocked attacker that also outsizes whatever was supposed to trade with it. A flyer already wants to attack into defenseless air, but the tap reaches the ground too, so the body keeps scaling while the opponent's best blocker sits frozen. The constraint is honest: with no energy banked, the attack trigger does nothing, leaving a plain 3/3 flyer that still quietly accrues energy off every creature you play. The design rewards the white-aggressive plan of flooding the board early, then spending the receipts at the exact moment they matter most, in the attack step.