Ezreal, Prodigal Explorer

Whenever an opponent casts a spell, untap Ezreal, Prodigal Explorer.
{t} Ezreal deals 1 damage to target creature.
{w}{t} Ezreal deals 2 damage to up to two target creatures.
{w}{u}{t} Ezreal 3 damage to each opponent.
{w}{u}{g}{t} Ezreal phases out until you cast a spell.