Nunu and Willump

{t}{1} Put 1 snowball counter on up to 3 target creatures.
{t} Remove every snowball counter in play.
Opponent's creatures that had a snowball counter
are tapped and do not untap on their next untap
step. Your creatures that had a snowball counter
gain vigilance until end of turn.
"Let's get in there and thwack some stuff!"