Energy Payoff

Cards that consume {E} energy counters as a cost to fuel an effect or activated ability, the spend side of Kaladesh's energy economy. Bristling Hydra pays {E}{E}{E} for a +1/+1 counter and hexproof, Longtusk Cub pumps itself, Aether Hub and Servant of the Conduit burn {E} for colored mana, Dynavolt Tower and Harnessed Lightning convert energy into damage, and Gonti's Aether Heart cashes eight {E} for an extra turn. Distinct from energy.energy_producer, which generates {E} counters without spending them, and from energy.energy_doubler, which scales production rather than consuming the resource.