The Lady Bane

Haste First Strike Vigilance Lifelink

When The Lady Bane enters the battlefield
all Drow get +1/+1 and have Deathtouch.
Sacrifice a non Drow elf, The Lady Bane gets
+1/+1 and has Reach.
All elf creature spells cost {2} less to cast.
Whenever The Lady Bane is placed in the
graveyard all creatures get -1/-1 until end of turn.