Catacomb Sifter — ruling 1

Cards with devoid use frames that are variations of the transparent frame traditionally used for Eldrazi. The top part of the card features some color over a background based on the texture of the hedrons that once imprisoned the Eldrazi. This coloration is intended to aid deckbuilding and game play.

Catacomb Sifter — ruling 2

A card with devoid is just colorless. It's not colorless and the colors of mana in its mana cost.

Catacomb Sifter — ruling 3

Other cards and abilities can give a card with devoid color. If that happens, it's just the new color, not that color and colorless.

Catacomb Sifter — ruling 4

Devoid works in all zones, not just on the battlefield.

Catacomb Sifter — ruling 5

If a card loses devoid, it will still be colorless. This is because effects that change an object's color (like the one created by devoid) are considered before the object loses devoid.

Catacomb Sifter — ruling 6

Eldrazi Scions are similar to Eldrazi Spawn, seen in the Zendikar block. Note that Eldrazi Scions are 1/1, not 0/1.

Catacomb Sifter — ruling 7

Eldrazi and Scion are each separate creature types. Anything that affects Eldrazi will affect these tokens, for example.

Catacomb Sifter — ruling 8

Sacrificing an Eldrazi Scion creature token to add {C} is a mana ability. It doesn't use the stack and can't be responded to.

Catacomb Sifter : règles, fonctionnement et interactions (MTG)

Catacomb Sifter is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.

Official card text

Devoid (This card has no color.) When this creature enters, create a 1/1 colorless Eldrazi Scion creature token. It has "Sacrifice this token: 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.)

How it works : Catacomb Sifter

Original English text — Wizards of the Coast / Scryfall

#1August 25, 2015· Wizards of the Coast
Cards with devoid use frames that are variations of the transparent frame traditionally used for Eldrazi. The top part of the card features some color over a background based on the texture of the hedrons that once imprisoned the Eldrazi. This coloration is intended to aid deckbuilding and game play.
No other card is named in this ruling.
#2August 25, 2015· Wizards of the Coast
A card with devoid is just colorless. It's not colorless and the colors of mana in its mana cost.
No other card is named in this ruling.
#3August 25, 2015· Wizards of the Coast
Other cards and abilities can give a card with devoid color. If that happens, it's just the new color, not that color and colorless.
No other card is named in this ruling.
#4August 25, 2015· Wizards of the Coast
Devoid works in all zones, not just on the battlefield.
No other card is named in this ruling.
#5August 25, 2015· Wizards of the Coast
If a card loses devoid, it will still be colorless. This is because effects that change an object's color (like the one created by devoid) are considered before the object loses devoid.
No other card is named in this ruling.
#6August 25, 2015· Wizards of the Coast
Eldrazi Scions are similar to Eldrazi Spawn, seen in the Zendikar block. Note that Eldrazi Scions are 1/1, not 0/1.
Card named in this ruling
Eldrazi Scion
#7August 25, 2015· Wizards of the Coast
Eldrazi and Scion are each separate creature types. Anything that affects Eldrazi will affect these tokens, for example.
No other card is named in this ruling.
#8August 25, 2015· Wizards of the Coast
Sacrificing an Eldrazi Scion creature token to add is a mana ability. It doesn't use the stack and can't be responded to.
Card named in this ruling
Eldrazi Scion
#9August 25, 2015· Wizards of the Coast
Some instants and sorceries that create Eldrazi Scions require targets. If all targets for such a spell have become illegal by the time that spell tries to resolve, the spell won't resolve and none of its effects will happen. You won't get any Eldrazi Scions.
Card named in this ruling
Eldrazi Scion