Cheapest priced copy (The List): $8.49 at Card Kingdom, near mint, their price list as of .
Phyrexian Soulgorger 
Snow Artifact Creature — Phyrexian Construct · 8/8 · Rare · The List · #CSP-141
Cumulative upkeep—Sacrifice a creature. (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it.)
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
2 printings · $8.49 to $59.99 at Card Kingdom
One ruling from Wizards of the Coast
- 15 July 2006When Phyrexian Soulgorger’s cumulative upkeep ability resolves, you must either sacrifice a different creature for each age counter on Phyrexian Soulgorger or sacrifice it. You may also sacrifice it as part of its own upkeep payment.