Power Without Equal is a common Scheme card from Duskmourn: House of Horror Commander (DSC), collector number 352. Current market price: $0.41, TCGplayer market prices via Scryfall.
When you set this scheme in motion, draw three cards. You have no maximum hand size until your next turn. If you control six or more lands, you may cast up to three spells from your hand without paying their mana costs.