Sword of Kaldra [Mirrodin]

Set: Mirrodin Type: Legendary Artifact — Equipment Rare Cost: {4} Equipped creature gets +5/+5. Whenever equipped creature deals damage to a creature, exile that creature. (Exile it only if it's still on the battlefield.) Equip {4} ({4}: Attach to target creature you control. Equip only as a sorcery. This card enters the battlefield unattached and stays on the battlefield if the creature leaves.)