Cosmic Crucible is a rare Enchantment card from Marvel Super Heroes Commander (MSC), collector number 397. Current market price: $1.71, TCGplayer market prices via Scryfall.
At the beginning of your first main phase, add four mana in any combination of colors. Whenever you cast a noncreature spell, you may copy it. You may choose new targets for the copy. Do this only once each turn. (A copy of a permanent spell becomes a token.)