Tag Along

You latch onto a creature mid-teleport, going along for the ride. 

When a creature you can see within uses any sort of spell or ability to teleport, you can use your reaction to travel with them to their destination. You appear in an open space nearest to the creature at their destination. You do not gain any special knowledge of their destination before you arrive there. The spell fails if the creature is traveling to another plane of existence. 

When you cast this spell using a spell slot of 6th level or higher, you can latch onto beings teleporting to other planes.