ETCHEDCheapest priced copy (March of the Machine: The Aftermath): $0.35 at Card Kingdom, near mint, their price list as of .
Death-Rattle Oni 
Creature — Demon Spirit · 5/4 · Uncommon · March of the Machine: The Aftermath · #113
Flash
This spell costs {2} less to cast for each creature that died this turn.
When this creature enters, destroy all other creatures that were dealt damage this turn.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
4 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| March of the Machine: The Aftermath | 13 | Uncommon | $0.35 | $0.49 |
| March of the Machine: The Aftermath | 63 | Uncommon | $0.35 | $0.49 |
| March of the Machine: The Aftermath | 113 | Uncommon | — | — |
| March of the Machine: The Aftermath | 197 | Uncommon | — | $0.49 |
2 rulings from Wizards of the Coast
- 12 May 2023The cost-reduction ability of Death-Rattle Oni doesn't change its mana cost or mana value, only the total cost you pay. Specifically, Death-Rattle Oni's mana value is always 7.
- 12 May 2023Count any creature that died during the turn, including token creatures, when calculating the cost reduction. For nontoken creatures that died, it doesn't matter what happened to the creature cards after they died.