Cheapest priced copy (Dissension): $0.49 at Card Kingdom, near mint, their price list as of .
Rakdos Riteknife 
Artifact — Equipment · Rare · The List · #DIS-164
Equipped creature gets +1/+0 for each blood counter on this Equipment and has "{T}, Sacrifice a creature: Put a blood counter on Rakdos Riteknife."
{B}{R}, Sacrifice this Equipment: Target player sacrifices a permanent of their choice for each blood counter on this Equipment.
Equip {2}
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
2 printings · $0.49 to $3.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Dissension | 164 | Rare | $0.49 | $3.99 |
| The List | DIS-164 | Rare | $0.59 | — |