Autumn's Veil

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.

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

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.