Cheapest priced copy (New Phyrexia): $0.35 at Card Kingdom, near mint, their price list as of .
Immolating Souleater 
Artifact Creature — Phyrexian Dog · 1/1 · Common · New Phyrexia · #139
{R/P}: This creature gets +1/+0 until end of turn. ({R/P} can be paid with either {R} or 2 life.)
Legal inCommanderModernLegacyVintagePauper
Not legal inBrawlStandardPioneer
2 printings · $0.35 to $1.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| New Phyrexia | 139 | Common | $0.35 | $1.99 |
| The List | NPH-139 | Common | $0.35 | — |