The Beast in the Cave

Skulk.
When this card go to the graveyard, investigate. (Create a colorless Clue artifact token with "{2}, Sacrifice this artifact: Draw a card.")
If you sacrifice a Clue this turn transform
the Beast in The Cave.
in an instant my delight was turned to horror as I
listened; thanks to my ever acute ear, bore to me the unexpected and dreadful knowledge that these footfalls
were not like those of any mortal man.
The Beast in the Cave—H. P. Lovecraft