Tormentor's Trident

• WOTC Official Reminder Textofficial rules
  Equip — Equip [cost] ([cost]: Attach to target creature you control. Equip only as a sorcery.)

• WWizards of the Coast2012-05-01
  Official Ruling
  You still decide which player or planeswalker the equipped creature attacks.
• WWizards of the Coast2012-05-01
  Official Ruling
  If, during your declare attackers step, the equipped creature is tapped, is affected by a spell or ability that says it can’t attack, or hasn’t been under your control continuously since the turn began (and doesn’t have haste), then it doesn’t attack. If there’s a cost associated with having a creature attack, you’re not forced to pay that cost, so it doesn’t have to attack in that case either.

Rulings via Scryfall