Dynavolt Tower

The conversion ratio is the whole design: every instant or sorcery banks two energy, the activation costs five, so no single spell ever pays for itself and even a pair of spells leaves you one short. The math forces a slow build, three spells minimum before the first shock, and that cadence is what makes the artifact a payoff for a deck already casting a high volume of cheap interaction: it turns spell density spent anyway into reusable reach. What sells the design is that the activation asks for no mana, only a tap and five stored energy, so the turn you empty your hand to cast spells is also the turn you can immediately fire the accumulated charge at a threat. That makes it quietly efficient in practice but slow to come online, and the slowness is the honest cost: for the first several turns it does nothing but sit there, a battery visibly filling, handing an opponent a clock to race and a reason to press before the meter fills. As a recurring source of three damage to any target, it functions as inevitability for a control shell: less a removal spell than a slowly winding kill condition that a spell-heavy deck powers as a byproduct of its normal turns. The energy mechanic asked players to treat a resource as a slow-charging battery you spend in bursts, and few cards embodied that bargain as literally, converting spell count into stored voltage and voltage into damage on your own schedule.