Eye of the Planesrunner

Wondrous item, very rare (requires attunement)
  This sphere of shifting scenes depicts the landscape of the plane it last visited. An iridescent lattice borders the eye, developing in complexity the more it sees of the planes of existence.
  To attune to the eye, it must be placed in an empty eye socket. It grants the vision of a normal eye for your race. As an action you can channel the eye’s planar energy to cast one of the following spells. If a saving throw is required, the DC is 16:
  • Blink (3rd-level)
  • Banishment (4th-level)
  • Contact other plane (5th-level)
  • Planar ally (6th-level)
  • Plane shift (7th-level)
  After the spell is cast, roll a d8. If the result of this roll is equal to or lower than the level of the cast spell, the eye’s energy floods into your brain. You take psychic damage equal to twice the number rolled and the eye can’t be used to cast any spell again until you finish a long rest.
  Uncommon variant: Remove the 5th to 7th level spells, change the d8 to a d4, and change the DC to 13.
  Rare variant: Remove the 6th and 7th level spells, change the d8 to a d6, and change the DC to 15.