Abhorrent Overlord (PTHS 75★)

Creature — Demon • Mana cost: {5}{B}{B} • Theros Promos • Rare

Flying
When this creature enters, create a number of 1/1 black Harpy creature tokens with flying equal to your devotion to black. (Each {B} in the mana costs of permanents you control counts toward your devotion to black.)
At the beginning of your upkeep, sacrifice a creature.

Illustrated by Dave Kendall.