The List

Bone Shredder

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 Bone Shredder enters, destroy target nonartifact, nonblack creature.

March of the Machine Commander

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 Bone Shredder enters the battlefield, destroy target nonartifact, nonblack creature.

Media Inserts

Modern Horizons 2

Duel Decks: Phyrexia vs. the Coalition

Urza's Legacy

Flying; echo (During your next upkeep after this permanent comes under your control, pay its casting cost or sacrifice it.) When Bone Shredder comes into play, destroy target nonartifact, nonblack creature.