Sorcerer of the Eternal Winter

Whenever Sorcerer of the Eternal Winter enters the battlefield, tap target creature. That creature doesn't untap during its controler's next untap step.
Freeze 4 (whenever this creature deals combat damage to another creature, tap that creature. It does'nt untap for 4 upkeeps, both yours and your opponent's)
{2}{s}, {t}: Tap target creature