Cheapest priced copy (Magic 2010): $0.35 at Card Kingdom, near mint, their price list as of .
Vampire Aristocrat 
Creature — Vampire Rogue Noble · 2/2 · Common · Modern Masters 2017 · #86
Sacrifice a creature: This creature gets +2/+2 until end of turn.
Legal inCommanderModernLegacyVintagePauper
Not legal inBrawlStandardPioneer
2 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Magic 2010 | 117 | Common | $0.35 | $0.49 |
| Modern Masters 2017 | 86 | Common | $0.35 | $0.49 |
2 rulings from Wizards of the Coast
- 1 October 2009You can sacrifice Vampire Aristocrat to activate its own ability, but it won't be around to get the bonus.
- 1 October 2009If you sacrifice an attacking or blocking creature during the declare blockers step, it won't deal combat damage. If you wait until the combat damage step, but that creature has been dealt lethal damage, it'll be destroyed before you get a chance to sacrifice it.