Cheapest priced copy (Innistrad: Crimson Vow Promos): $0.49 at Card Kingdom, near mint, their price list as of .
Dominating Vampire 
Creature — Vampire · 3/3 · Rare · Innistrad: Crimson Vow · #305
When this creature enters, gain control of target creature with mana value less than or equal to the number of Vampires you control until end of turn. Untap that creature. It gains haste until end of turn.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
6 printings · $0.49 to $3.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Innistrad: Double Feature | 421 | Rare | $0.99 | $3.99 |
| Innistrad: Crimson Vow Promos | 154p | Rare | $0.49 | $2.99 |
| Innistrad: Crimson Vow Promos | 154s | Rare | — | $1.49Out of stock |
| Innistrad: Crimson Vow | 154 | Rare | $0.49 | $0.49 |
| Innistrad: Crimson Vow | 305 | Rare | $0.49 | $0.99 |
| Innistrad: Crimson Vow | 407 | Rare | — | $0.59 |
One ruling from Wizards of the Coast
- 19 November 2021You will keep control of the creature until end of turn even if the number of Vampires you control changes after the ability has resolved.