Vaan, Lord of the Night

Flying
Whenever a Bat you control deals combat damage to a player, you may draw a card and lose 1 life.
Other Bats you control get +1/+1.
{2}, Sacrifice another Bat: Put a +1/+1 counter on Vaan, Lord of the Night.
"In the shadowed realm, Vaan commands the winged denizens of the night, their loyalty sealed in the blood
they share."