Tireless Tracker

Landfall -Whenever a land enters the battlefield
under your control, investigate (To investigate,
create a colorless Clue token. It's an artifact with "{2}, Sacrifice this artifact: Draw a card.").
Whenever you sacrifice a Clue, put a +1/+1
counter on Tireless Tracker.
"So, according to our fox friend there, the guy we are
after is heading straight to them... I guess we'd better
find him before he is served at tea time..."