Kahlder Frostborn

Whenever you cast an instant or sorcery spell,
you may choose one:
{r}: Kahlder Frostborn deals X damage to
up to three targets.
{u}: Create X/X blue elemental token creature.
{w}: Tap target creature ,
if its power is equal or lower than X
it doesnt untap on its owners next untap step.
X is the spells converted mana cost.