Lust for War - mtg.wtf

2010-06-15 If, during its controller's declare attackers step, the enchanted creature is tapped, is affected by a spell or ability that says it can't attack, or is affected by "summoning sickness," then that creature doesn't attack. If there's a cost associated with having that creature attack, its controller isn't forced to pay that cost, so the creature doesn't have to attack in that case either.
2010-06-15 Lust for War's triggered ability triggers when the enchanted creature becomes tapped for any reason, not just when it attacks.

Card is in preconstructed decks:

mtg.wtf