Cheapest priced copy (Innistrad: Double Feature): $0.35 at Card Kingdom, near mint, their price list as of .
Ollenbock Escort 
Creature — Human Cleric · 1/1 · Uncommon · Innistrad: Crimson Vow · #27
Vigilance
Sacrifice this creature: Target creature you control with a +1/+1 counter on it gains lifelink and indestructible until end of turn.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
2 printings · $0.35 to $0.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Innistrad: Double Feature | 294 | Uncommon | $0.35 | $0.99 |
| Innistrad: Crimson Vow | 27 | Uncommon | $0.35 | $0.49 |
One ruling from Wizards of the Coast
- 19 November 2021The creature having a +1/+1 counter on it is part of the targeting requirement of Ollenbock Escort's ability. After the ability has resolved, the creature won't lose lifelink or indestructible if the counter goes away.