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.
//
Shadows' Lair
(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.
The shadows make no mark upon the flesh. It is the mind they claw and strangle.