(Traps can only be played from arsenal.)
Target attack gets -2 [Power] unless the attacking hero pays [1 Resource]. (The attacking hero chooses whether to pay [1 Resource] as Rock Slide Trap resolves.)
NM-Mint Unlimited Normal - $0.40
Lightly Played Unlimited Normal - $0.30
Moderately Played Unlimited Normal - $0.30
Heavily Played Unlimited Normal - $0.30
Damaged Unlimited Normal - $0.20