Unnatural Aggression — ruling 1

If the creature an opponent controls survives the fight but would die later in the turn for another reason, it will be exiled instead, whether your creature dealt it damage or not.

Unnatural Aggression — ruling 2

If the creature you control becomes an illegal target (perhaps due to being destroyed by another spell or ability), Unnatural Aggression will resolve, but the target creature an opponent controls will neither deal nor receive any damage. If that creature would die later in the turn for another reason, it will be exiled instead.

Unnatural Aggression — ruling 3

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.

Unnatural Aggression — ruling 4

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

Unnatural Aggression — ruling 5

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.

Unnatural Aggression — ruling 6

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

Unnatural Aggression — ruling 7

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.

Unnatural Aggression : règles, fonctionnement et interactions (MTG)

Unnatural Aggression 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.) Target creature you control fights target creature an opponent controls. If the creature an opponent controls would die this turn, exile it instead.

How it works : Unnatural Aggression

Original English text — Wizards of the Coast / Scryfall

#1August 25, 2015· Wizards of the Coast
If the creature an opponent controls survives the fight but would die later in the turn for another reason, it will be exiled instead, whether your creature dealt it damage or not.
No other card is named in this ruling.
#2August 25, 2015· Wizards of the Coast
If the creature you control becomes an illegal target (perhaps due to being destroyed by another spell or ability), Unnatural Aggression will resolve, but the target creature an opponent controls will neither deal nor receive any damage. If that creature would die later in the turn for another reason, it will be exiled instead.
No other card is named in this ruling.
#3August 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.
#4August 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.
#5August 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.
#6August 25, 2015· Wizards of the Coast
Devoid works in all zones, not just on the battlefield.
No other card is named in this ruling.
#7August 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.