Magyck, Battle-Ready Sorcerer

When Magyck enters the battle ield with 4 Spell-Slot Counters. When you use a Cast ability, remove a counter.
{x}{2}, {t}: Cast Delayed Fireball — Target up to 3 creatures a player controls. Deal {x} damage to each creature.
{6}, {t}: Cast Disintegrate — Target a creature. Deal 7 damage. If the creature is destroyed, exile it.
{t}, Firebolt — Place a level-up counter on Magyck. Deal {x} damage where {x} is equal to the number of level up counters divided by 2, rounded down.