Tireless Tracker - SOI Reprint (PLST) from The List, available at 401 Games Canada.

• Rarity: Rare
• Finish: Normal
• Artist: Eric Deschamps
• Card Text:
  Whenever a land enters the battlefield under your control, investigate. (Put a colorless Clue artifact token onto the battlefield with "2, Sacrifice this artifact: Draw a card.")
  Whenever you sacrifice a Clue, put a +1/+1 counter on Tireless Tracker.