Energy Payoff

Cards that consume stored {E} energy counters as a cost to unlock a payoff: Bristling Hydra pays {E}{E}{E} for a +1/+1 counter and hexproof, Whirler Virtuoso pays {E}{E}{E} to make a Thopter, Aetherworks Marvel pays six {E} to cast a spell for free, and Dynavolt Tower pays five {E} to deal 3 damage to any target. These are the spend side of the energy engine, turning accumulated counters into board presence, damage, or value. Distinct from Energy Producer, which generates {E} via enter-the-battlefield or combat triggers without spending it, and from Energy Doubler, which scales how much {E} you bank rather than cashing it in.