Bone Shredder is a uncommon Creature — Phyrexian Minion card from March of the Machine Commander (MOC), collector number 247. Current market price: $0.14, TCGplayer market prices via Scryfall.
Flying Echo {2}{B} (At the beginning of your upkeep, if this came under your control since the beginning of your last upkeep, sacrifice it unless you pay its echo cost.) When this creature enters, destroy target nonartifact, nonblack creature.