The Lonesome Wanderer

Whenever you attack, investigate. (Create a Clue token.
It's an artifact with "{2}, Sacrifice this artifact: Draw
a card.")

At the beginning of your end step, if you sacrificed a Clue
this turn, you may put a quest counter on target nonland
permanent you control.

{1}, {t}, Tap an untapped artifact you control: Choose
target nonland permanent you own. You gain 1 life and
get an {e} for each quest counter on that permanent,
then return that permanent to your hand.