Your Plans Mean Nothing is a common Scheme card from Duskmourn: House of Horror Commander (DSC), collector number 367. Current market price: $0.33, TCGplayer market prices via Scryfall.
When you set this scheme in motion, any number of target players each discard their hands. Each opponent draws cards equal to the number of cards that player discarded minus one. Then if you discarded a card this way, draw seven cards.