Cheapest priced copy (The List): $0.35 at Card Kingdom, near mint, their price list as of .
Farbog Revenant 
Creature — Spirit · 1/3 · Common · Shadows over Innistrad · #110
Skulk (This creature can't be blocked by creatures with greater power.)
Lifelink (Damage dealt by this creature also causes you to gain that much life.)
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
2 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| The List | SOI-110 | Common | $0.35 | — |
| Shadows over Innistrad | 110 | Common | $0.35 | $0.49 |
2 rulings from Wizards of the Coast
- 8 April 2016Skulk matters only as blockers are chosen. Modifying either creature’s power after blockers are chosen won’t cause the attacking creature to become unblocked.
- 8 April 2016If you cause a creature to have 0 power or less, use the actual value (which may be negative) to determine whether it can block or be blocked. A creature with skulk and 0 or less power most likely won’t be blocked, but it won’t deal combat damage and won’t trigger any abilities that trigger when combat damage is dealt.