Hagnah-Tin Dead Lands

Hagnah-Tin Dead Lands enters the battlefield tapped.
{t}: Add {b} to your mana pool.
Tap a Vampire you control, {t}:
Destroy {x} target creatures with toughness less or equal to tapped vampire's power, where {x} is the number of Hagnah-Tin Dead Lands you control. Activate this ability only if a creature you control went to your graveyard this or last turn.
Getting ambushed by hagnah-tinians is way better than ambushing them.
—Krunen Anabath, Unnoticed