Arthas, the Lich King

Frostbite
At the beginning of your upkeep, draw X cards where X is the number of Zombie Death Knights you control.
{1}{u}{b}: Create a 2/2 Zombie Death Knight token with frostbite.
(If this creature where to deal damage to another, it freezes it until next players end step, the creature can not attack or block.)
When Arthas, the Lich King dies, return it to it's owner's hand at the next end step.