Caleb, Cerberus Prodigy

Caleb, Cerberus Prodigy cannot attack.
{t}{w}{w}: Caleb, Cerberus Prodigy gains +0/+5
until end of turn.
{t}{2}{u}{u}: Counter target spell.
{t}{x}{x}{r}: Caleb, Cerberus Prodigy deals X
damage to target creature or planeswalker.