"Since your last turn" means between the end of your last turn and now. Your last turn does not qualify, your current turn does.
100816
Ghost-Eater
+1 stealth hunt action.
Choose a minion or retainer in any ash heap who was burned from play since your last turn. Remove the chosen minion or retainer from the game to add X blood to this Harbinger of Skulls, where X is the capacity of the chosen vampire or the starting life of the chosen ally or retainer.
Rulings
A minion can only perform this special hunt once per turn.
Is an undirected action, even when targeting another Methuselah's ash heap.
Cannot be played if no target is available in any Methuselah's ash heap.