Ice Sovereign

Flying, Flash
When Ice Sovereign enters the battlefield, tap up to two target creatures. They don't untap during their controllers' next untap step.
{t}{x}{u}: Tap x non-dragon creatures.
{t}{x}{u}{u}{u}: Untap x dragon creatures.
{t}{x}{5}{u}{u}{u}{u}: Draw x cards, tap x non-dragon creatures and untap x dragon creatures.