FOILCheapest priced copy (The List): $6.99 at Card Kingdom, foil, near mint, their price list as of .
Wall of Shards 
Snow Creature — Wall · 1/8 · Uncommon · The List · #CSP-23
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.)
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
2 printings · $6.99 to $15.99 at Card Kingdom
2 rulings from Wizards of the Coast
- 15 July 2006When paying Wall of Shards’ cumulative upkeep, you may choose a different opponent for each age counter, or you can choose the same opponent multiple times.
- 1 October 2008Paying cumulative upkeep is always optional. If it’s not paid, the permanent with cumulative upkeep is sacrificed. Partial payments of the total cumulative upkeep cost can’t be made. For example, if a permanent with “cumulative upkeep {1}” has three age counters on it when its cumulative upkeep ability triggers, it gets another age counter and then its controller chooses to either pay {4} or sacrifice the permanent.