Cheapest priced copy (Double Masters): $0.99 at Card Kingdom, near mint, their price list as of .
Falkenrath Aristocrat 
Creature — Vampire Noble · 4/1 · Mythic · Dark Ascension · #138
Flying, haste
Sacrifice a creature: This creature gains indestructible until end of turn. If the sacrificed creature was a Human, put a +1/+1 counter on this creature.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
3 printings · $0.79 to $4.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Double Masters | 195 | Rare | $0.99 | $0.99 |
| Dark Ascension | 138 | Mythic | $0.99 | $4.49 |
| Modern Masters 2017 | 163 | Rare | $0.99 | $0.79 |
3 rulings from Wizards of the Coast
- 7 August 2020If the sacrificed creature was a Human, Falkenrath Aristocrat gains indestructible and also gets a +1/+1 counter.
- 7 August 2020You can sacrifice Falkenrath Aristocrat to pay the cost of its own ability. It won't receive a counter or gain indestructible, but it will enable abilities that check when or if a creature dies.
- 7 August 2020Falkenrath Aristocrat's activated ability checks whether the sacrificed creature was a Human as it last existed on the battlefield. It doesn't matter what its creature types are in the graveyard.