Ye Ole's Switcharoo

When a creature you can see makes an attack against you and hits you, you momentarily twist space to avoid the attack by using a reaction to swap places with a target: a creature, or an object not anchored to the ground.
The target must be something you can see within range; the target must be of the same size category as you or smaller.

The target must make a Constitution saving throw. On a failed save, you instantly swap places with the target, and the target takes the full damage of the triggering attack instead of you. On a successful save, you and the target still swap places, but you take the full damage of the triggering attack instead of the target.

You must cast this spell before the damage of the triggering attack is rolled.