Cheapest priced copy (Murders at Karlov Manor Commander): $5.99 at Card Kingdom, near mint, their price list as of .
Comeuppance 
Instant · Mythic · Marvel Universe · #1
Prevent all damage that would be dealt to you and planeswalkers you control this turn by sources you don't control. If damage from a creature source is prevented this way, Comeuppance deals that much damage to that creature. If damage from a noncreature source is prevented this way, Comeuppance deals that much damage to the source's controller.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
3 printings · $5.99 to $9.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Commander 2014 | 4 | Rare | $8.99 | — |
| Marvel Universe | 1 | Mythic | $7.49 | $9.99 |
| Murders at Karlov Manor Commander | 58 | Rare | $5.99 | — |
One ruling from Wizards of the Coast
- 7 November 2014Comeuppance's effect is not a redirection effect. If it prevents damage, Comeuppance (not the original source) deals damage to the permanent or player as part of that prevention effect. Comeuppance is the source of the new damage, so the characteristics of the original source (such as its color, or whether it had lifelink or deathtouch) don't affect the new damage. The new damage is not combat damage, even if the prevented damage was.