Errant Inquisitor

Whenever another creature with power 2 or less enters the battlefield under your control, investigate. (Create a colorless Clue artifact token with " {2}, Sacrifice this artifact: Draw a card.")
Errant Inquisitor gets +1/+1 for each Clue you control.
Whenever you sacrifice a Clue, put two +1/+1 counters on Errant Inquisitor.