Zarya, Energy Accumulator

Trample, Vigilance, Ultimate Charge
{1}{g}: Put a shield counter on target creature you control without a shield counter. Remove it at the beginning of the next end step.
Whenever a shield counter is removed from a creature you control by a source an opponent controls, add 3 charge counters onto Particle
Cannon.
Graviton Surge—{4}{g}, {t}, remove 15 ultimate
counters from Zarya: Create a 0/20 Graviton
Surge token. Activate only as a sorcery.