Anticipate Arcana

3rd-level divination (temporal)

Casting Time: 1 reaction, which you take when an enemy you can see casts a spell
Range: Self
Components: V, S
Duration: Instantaneous

Your foresight gives you an instant to ready your defenses against a magical attack. When you cast anticipate arcana, you have advantage on saving throws against spells and other magical effects until the start of your next turn.