Cheapest priced copy (Innistrad: Crimson Vow): $8.49 at Card Kingdom, near mint, their price list as of .
Cemetery Prowler 
Creature — Wolf · 3/4 · Mythic · Innistrad: Crimson Vow · #385
Vigilance
Whenever this creature enters or attacks, exile a card from a graveyard.
Spells you cast cost {1} less to cast for each card type they share with cards exiled with this creature.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
5 printings · $8.49 to $37.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Innistrad: Double Feature | 458 | Mythic | $10.99 | $37.99 |
| Innistrad: Crimson Vow Promos | 191p | Mythic | $13.99 | $14.99Out of stock |
| Innistrad: Crimson Vow Promos | 191s | Mythic | — | $10.99 |
| Innistrad: Crimson Vow | 191 | Mythic | $8.49 | $11.99 |
| Innistrad: Crimson Vow | 385 | Mythic | $9.99 | $13.99 |
2 rulings from Wizards of the Coast
- 19 November 2021Card types that can be exiled from a graveyard include artifact, creature, enchantment, land, planeswalker, instant, and sorcery. Legendary, basic, and snow are supertypes, not card types. Human, Equipment, and Aura are subtypes, not card types.
- 19 November 2021Cemetery Prowler's last ability checks the number of card types among cards exiled with it, not the number of cards exiled. For example, if Cemetery Prowler has exiled two creature cards, creature spells you cast cost {1} less, not {2} less.