Betray the Oath

Destroy target creature. If that creature was Legendary, that creature's controller sacrifices a creature. If they cannot sacrifice a creature, they lose 5 life.
If you control Asterith Artorias, put a loyalty counter on him. If you control Asterith, Zale's General, put two +1/+1 counters on him.
"She was a poison on this land! Her evil has plagued us for far too long! No more!"