Alternatives to Unshakable Tail

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Unshakable Tail {2}

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 " {2} , Sacrifice this token: Draw a card.") {2} , Sacrifice a Clue: Return this card from your graveyard to your hand.

Here are 4 cards you can replace Unshakable Tail with in your deck.