Dream Tides

{2}{U}{U} · Enchantment

Creatures don't untap during their controllers' untap steps. At the beginning of each player's upkeep, that player may choose any number of tapped nongreen creatures they control and pay {2} for each creature chosen this way. If the player does, untap those creatures.

Motor: se resuelve a mano

Rulings (1)

You can only untap nongreen creatures once, since this has a beginning of upkeep triggered ability.
Wizards of the Coast · 2006-02-01