Brainwash
Enchantment — Aura
Enchant creature
Enchanted creature can't attack unless its controller pays 
.
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Illustrated by
Fifth Edition#13CommonEnglishLegality
Rulings
Oct 4, 2004
This ability is paid for during the declare attackers step of the combat phase.
Oct 4, 2004
If there are multiple combat phases during the turn, the attack cost must be paid each time if you want to attack with the creature.
Oct 4, 2004
Paying this cost is not an instant or any other kind of ability, it is an additional cost on the declaration of the attacker.