Howling Deathcaller

Menace
Cleave {7}{b}{b} (You may cast this spell for its cleave
cost. If you do, remove the words in square brackets.)
When Howling Deathcaller enters the battlefield, destroy each other creature [with power 2 or less.]
Howling Deathcaller's power and toughness are
each equal to the number of creature cards in all graveyards.