Wall of Shards (Coldsnap)

Defender, flying Cumulative upkeep—An opponent gains 1 life. (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it.)

NM - $7.50
LP - $6.00
MP - $4.50
HP - $3.00
DMG - $1.50