The Hound of the Baskervilles

Whenever you sacrifice a Clue, if you don't
control a Legendary Creature named The Hound
of the Baskervilles, create a Legendary 3/3 black
and white creature token named The Hound of
the Baskervilles.
Whenever a Legendary Dog you control attacks, Investigate. (Create a colorless Clue artifact token
with "2, Sacrifice this artifact: Draw a card.")