At the beginning of your upkeep, sacrifice Koskun Falls unless you tap an untapped creature you control. Creatures can't attack you unless their controller pays {2} for each creature they control that's attacking you.
Near Mint - $12.30
Lightly Played - $11.10
Played - $8.70
Heavily Played - $7.40
Damaged - $6.20
Near Mint Non-English - $12.30
Lightly Played Non-English - $11.10
Played Non-English - $8.70
Heavily Played Non-English - $7.40
Damaged Non-English - $6.20