Surestrike Trident [Darksteel]

Equipped creature has first strike and "T, Unattach Surestrike Trident: This creature deals damage equal to its power to target player or planeswalker."
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.)