Black creatures can't attack unless their controller sacrifices a land for each black creature they control that's attacking. (This cost is paid as attackers are declared.)
"We shall oppose Lim-Dûl and his forces by any means necessary, even if the very earth be torn asunder."
—Arna Kennerüd, Skyknight
NM-Mint - $1.00
Lightly Played - $0.90
Moderately Played - $0.80
Heavily Played - $0.70
Damaged - $0.50
NM-Mint Non English - $1.00
Lightly Played Non English - $0.90
Moderately Played Non English - $0.80
Heavily Played Non English - $0.70
Damaged Non English - $0.50