Whenever a creature you control attacks alone, it gains deathtouch and lifelink until end of turn. Put a dread counter on Grasping Shadows. Then if there are three or more dread counters on it, transform it.

(Transforms from Grasping Shadows.) {T}: Add {B}. {B}, {T}, Remove a dread counter from Shadows' Lair: You draw a card and you lose 1 life.