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
Near Mint - $600
Lightly Played - $500
Moderately Played - $400
Heavily Played - $400
Damaged - $300
Near Mint Spanish - $600
Lightly Played Spanish - $500
Moderately Played Spanish - $400
Heavily Played Spanish - $400
Damaged Spanish - $300