Alquist Proft, Master Sleuth (MKM 355)

Legendary Creature — Human Detective • Mana cost: {1}{W}{U} • Murders at Karlov Manor • Mythic

Vigilance
When Alquist Proft enters, investigate. (Create a Clue token. It's an artifact with "{2}, Sacrifice this token: Draw a card.")
{X}{W}{U}{U}, {T}, Sacrifice a Clue: You draw X cards and gain X life.

Illustrated by Peter Diamond.