Pahari Kawa, The Historian

Whenever you cast a historic spell, you gain life
equal to that spells converted mana cost.
(Artifacts, legendaries, and Sagas are historic.)
At the beginning of your end step, if you gained
life this turn investigate. (Create a colorless Clue artifact token with {2}, Sacrifice this artifact: Draw a
card.")
"There are things the Vanta Lord hasn't told you..."