Cheapest priced copy (Modern Horizons 2): $0.35 at Card Kingdom, near mint, their price list as of .
Bone Shredder 
Creature — Phyrexian Minion · 1/1 · Uncommon · March of the Machine Commander · #247
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.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
7 printings · $0.35 to $22.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Duel Decks: Phyrexia vs. the Coalition | 5 | Uncommon | $0.49 | — |
| Modern Horizons 2 | 272 | Uncommon | $0.35 | $0.49 |
| March of the Machine Commander | 247 | Uncommon | $0.35 | — |
| The List | ULG-49 | Uncommon | $0.35 | — |
| Media and Collaboration Promos | 2021-2 | Rare | — | — |
| Media and Collaboration Promos | 2025-16 | Rare | — | — |
| Urza's Legacy | 49 | Uncommon | $0.49 | $22.99 |
2 rulings from Wizards of the Coast
- 18 June 2021Paying for echo is always optional. When the echo triggered ability resolves, if you can't pay the echo cost or choose not to, you sacrifice that permanent.
- 18 June 2021Your permanent's echo ability will trigger at the beginning of your upkeep if it entered the battlefield since the beginning of your last upkeep, or if you gained control of it since the beginning of your last upkeep.