Vuthar, Frostblade Reaver

Whenever a giant you control enters the
battlefield or attacks, you may tap target creature.
At the beginning of your end step, Vuthar,
Frostblade Reaver deals X damage to each
opponent, where X is the number of tapped
creatures they control. You may draw X cards.
In his wake he leaves those who dared oppose him,
turned to solid ice, forever staring silently from their
frozen prison.