If an opponent had a green creature enter the battlefield under their control this turn, you may payrather than pay this spell's mana cost.
Tap up to two target creatures. Those creatures don't untap during their controller's next untap step.
3/1/2010 You may target any two (or fewer) creatures. It’s okay if any of them are already tapped. If you cast Permafrost Trap for , you don’t have to target the green creature that entered the battlefield under an opponent’s control.
3/1/2010 If a targeted creature is untapped at the time its controller’s next untap step begins, the second part of the ability has no effect on it.
3/1/2010 If an affected creature changes controllers before its previous controller’s next untap step, this ability will prevent it from untapping during its new controller’s next untap step.