Autumn's Veil — ruling 1

After Autumn’s Veil resolves, no new blue or black spell may be cast that turn targeting a creature you control.

Autumn's Veil — ruling 2

Keep in mind that an Aura spell targets the permanent it will enchant (but an Aura on the battlefield doesn’t target the permanent it’s attached to).

Autumn's Veil — ruling 3

Autumn’s Veil itself may be countered by blue or black spells. Its effect doesn’t apply until after it resolves.

Autumn's Veil — ruling 4

After Autumn’s Veil resolves, any spell you control that turn can still be targeted by spells that try to counter it (such as Cancel), regardless of their color. If those spells are blue or black at the time they would resolve, they will resolve, but the part of their effect that would counter the spell you control simply won’t do anything. Any other effects those spells have will work as normal.

Autumn's Veil — ruling 5

If a creature you control is being targeted by a spell when Autumn’s Veil resolves, nothing happens right away. When that spell would resolve, its color is checked. If it’s blue or black, that creature will be an illegal target for that spell, and will be unable to be affected by it. If all that spell’s targets have become illegal by the time it would resolve, it won’t resolve.

Autumn's Veil — ruling 6

Autumn’s Veil affects any spells and creatures you happen to control at any point during the rest of the turn, not just spells and creatures you control as it resolves. That’s because it doesn’t grant an ability to those spells or creatures; rather, it affects the game rules and states something that’s now true about those spells and creatures.

Autumn's Veil — ruling 7

Autumn’s Veil has no effect on abilities. After it resolves, spells you control may be countered by abilities from blue or black sources, and creatures you control may be targeted by abilities from blue or black sources.

Autumn's Veil : règles, fonctionnement et interactions (MTG)

Autumn's Veil 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

Spells you control can't be countered by blue or black spells this turn, and creatures you control can't be the targets of blue or black spells this turn.

How it works : Autumn's Veil

Original English text — Wizards of the Coast / Scryfall

#1August 15, 2010· Wizards of the Coast
After Autumn’s Veil resolves, no new blue or black spell may be cast that turn targeting a creature you control.
No other card is named in this ruling.
#2August 15, 2010· Wizards of the Coast
Keep in mind that an Aura spell targets the permanent it will enchant (but an Aura on the battlefield doesn’t target the permanent it’s attached to).
No other card is named in this ruling.
#3August 15, 2010· Wizards of the Coast
Autumn’s Veil itself may be countered by blue or black spells. Its effect doesn’t apply until after it resolves.
No other card is named in this ruling.
#4August 15, 2010· Wizards of the Coast
After Autumn’s Veil resolves, any spell you control that turn can still be targeted by spells that try to counter it (such as Cancel), regardless of their color. If those spells are blue or black at the time they would resolve, they will resolve, but the part of their effect that would counter the spell you control simply won’t do anything. Any other effects those spells have will work as normal.
No other card is named in this ruling.
#5August 15, 2010· Wizards of the Coast
If a creature you control is being targeted by a spell when Autumn’s Veil resolves, nothing happens right away. When that spell would resolve, its color is checked. If it’s blue or black, that creature will be an illegal target for that spell, and will be unable to be affected by it. If all that spell’s targets have become illegal by the time it would resolve, it won’t resolve.
No other card is named in this ruling.
#6August 15, 2010· Wizards of the Coast
Autumn’s Veil affects any spells and creatures you happen to control at any point during the rest of the turn, not just spells and creatures you control as it resolves. That’s because it doesn’t grant an ability to those spells or creatures; rather, it affects the game rules and states something that’s now true about those spells and creatures.
No other card is named in this ruling.
#7August 15, 2010· Wizards of the Coast
Autumn’s Veil has no effect on abilities. After it resolves, spells you control may be countered by abilities from blue or black sources, and creatures you control may be targeted by abilities from blue or black sources.
No other card is named in this ruling.