Cheapest priced copy (Odyssey): $0.35 at Card Kingdom, near mint, their price list as of .
Whipkeeper 
Creature — Dwarf · 1/1 · Uncommon · Odyssey · #228
{T}: This creature deals damage to target creature equal to the damage already dealt to it this turn.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
1 printing · $0.35 to $1.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Odyssey | 228 | Uncommon | $0.35 | $1.49 |
2 rulings from Wizards of the Coast
- 4 October 2004If the creature regenerated during the turn, and thereby had all damage on it removed, the damage before it regenerated was still dealt that turn and will be counted.
- 4 October 2004This counts all damage that was dealt during the turn. This does not include any damage that was prevented.