Frostbite, the Chill Blade

Equipped creature gets +2/+0 and has Vigilance.
Whenever equipped creature deals damage to a
creature, tap that creature. It doesn't untap
during its controllers untap step for as long as
Frostbite, the Chill Blade is on the battlefield.
Equip {1}{w/u}
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Chilled to the bone.