Glen Elendra is a common Plane — Lorwyn card from Planechase Anthology Planes (OPCA), collector number 28. Current market price: $3.40, TCGplayer market prices via Scryfall.
At end of combat, you may exchange control of target creature you control that dealt combat damage to a player this combat and target creature that player controls. Whenever chaos ensues, gain control of target creature you own.