Tiamat, Legion of Darkness

Flying, trample, deathtouch, lifelink
Other bat creatures you control get +1/+1 and have deathtouch and lifelink.
Whenever a vampire creature you control dies, create a 1/1 black bat creature token with flying.
Pay 2 life, sacrifice a creature: Draw a card.
"The Hell-Bat honors their damnation."