Forum:Card of sacrifice card

in the DP10 pack, there is a trap card that says

"Draw 2 cards, if the combined ATK of all your face-up Attack Position monsters (minimum 2) is less than the ATK of your opponent's face-up monster with the lowest ATK. You cannot Summon or change Battle Position the turn you activate this card."

does that i can activate without monsters? or do i need 2 monsters to activate?24.17.103.45 (talk) 18:04, February 19, 2011 (UTC)