Devoid (This card has no color.)

When Catacomb Sifter enters, create a 1/1 colorless Eldrazi Scion creature token. It has "Sacrifice this creature: Add ."

Whenever another creature you control dies, scry 1. (Look at the top card of your library. You may put that card on the bottom.)

When Shipwreck Sifters enters, draw a card, then discard a card.

Whenever you discard a Spirit card or a card with disturb, put a +1/+1 counter on Shipwreck Sifters.

Draw two cards, then discard a card.

If you've cast a spell named Peer Through Depths and a spell named Reach Through Mists this turn, you may search your library for a card named The Unspeakable, put it onto the battlefield, then shuffle.

Trample

When Sifter Wurm enters, scry 3, then reveal the top card of your library. You gain life equal to that card's mana value.

Flying

When Wavesifter enters, investigate twice. (To investigate, create a Clue token. It's an artifact with ", Sacrifice this artifact: Draw a card.")

Evoke (You may cast this spell for its evoke cost. If you do, it's sacrificed when it enters.)