Lunarch Veteran // Luminous Phantom

The back face of each card with disturb has an ability that instructs its controller to exile if it would be put into a graveyard from anywhere. This includes going to the graveyard from the stack, so if the spell is countered after you cast it using the disturb ability, it will be put into exile.

When you cast a spell using a card's disturb ability, the card is put onto the stack with its back face up. The resulting spell has all the characteristics of that face.

"Disturb [cost]" means "You may cast this card transformed from your graveyard by paying [cost] rather than its mana cost."