Sombra, Devious Hacker

Shroud, Ultimate Charge
Sombra, Devious Hacker can't be blocked.
{u}{u}{b}: Counter target spell or ability. Add 2 ultimate counters onto Sombra.
EMP—{3}{u}{b}, {t}, remove 12 ultimate
counters from Sombra: Counter all spells and abilities your opponents control. Your opponents
can't cast spells or play abilities this turn. Deal
damage to each of your opponents creatures
equal to half its current toughness.