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}
2004-12-01
Surestrike Trident grants an ability to the equipped creature.
2004-12-01
The equipped creature's controller chooses whether or not to activate the activated ability. It doesn't matter who controls Surestrike Trident.
2004-12-01
"Unattach Surestrike Trident" means just that — Surestrike Trident moves off the creature it was equipping and remains on the battlefield.