Ninja Teen

(Gain the next level as a sorcery to add its ability.) Whenever a creature you control leaves the battlefield, each opponent loses 1 life. {1}{B}: Level 2 Creatures you control get +1/+0 and have menace. {B}: Level 3 Creature cards in your graveyard have sneak {3}{B}. You may cast creature spells from your graveyard using their sneak abilities.