Cheapest priced copy (The List): $0.35 at Card Kingdom, near mint, their price list as of .
Pitchstone Wall 
Creature — Wall · 2/5 · Uncommon · The List · #TOR-110
Defender (This creature can't attack.)
Whenever you discard a card, you may sacrifice this creature. If you do, return the discarded card from your graveyard to your hand.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper