Reality Is Mine to Control is a common Ongoing Scheme card from Duskmourn: House of Horror Commander (DSC), collector number 354. Current market price: $0.62, TCGplayer market prices via Scryfall.
(An ongoing scheme remains face up until it's abandoned.) Whenever you cast a spell, you may abandon this scheme. If you do, copy that spell, and you may choose new targets for the copy. (A copy of a permanent spell becomes a token.)