View on Scryfall

Unshakable Tail

Creature — Zombie Detective

When this creature enters and at the beginning of your upkeep, surveil 1. Whenever one or more creature cards are put into your graveyard from your library, investigate. (Create a Clue token. It's an artifact with ", Sacrifice this token: Draw a card.") , Sacrifice a Clue: Return this card from your graveyard to your hand.