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Flying, haste
Sacrifice a creature: Falkenrath Aristocrat gains indestructible until end of turn. If the sacrificed creature was a Human, put a +1/+1 counter on Falkenrath Aristocrat.
Falkenrath 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.
If the sacrificed creature was a Human, Falkenrath Aristocrat gains indestructible and also gets a +1/+1 counter.
You 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.
