Whiplash Trap

Oracle Text

If an opponent had two or more creatures enter the battlefield under their control this turn, you may pay U rather than pay this spell's mana cost.

Return two target creatures to their owners' hands.

Card Rulings

10/1/2009 You may ignore a Trap’s alternative cost condition and simply cast it for its normal mana cost. This is true even if its alternative cost condition has been met.
10/1/2009 Casting a Trap by paying its alternative cost doesn’t change its mana cost or converted mana cost. The only difference is the cost you actually pay.
10/1/2009 Effects that increase or reduce the cost to cast a Trap will apply to whichever cost you chose to pay.
10/1/2009 You must target two creatures as you cast Whiplash Trap. If you can’t (because just one creature is on the battlefield, perhaps), you can’t cast the spell.
10/1/2009 You can target any two creatures, not just ones that entered the battlefield this turn.