Gix's Caress

Discard has always carried a hidden tax: three mana to pull a card from an opponent's hand reads as fair when the alternative is unconditional and sorcery-speed, but the turn you spend doing it is a turn you fall behind on board. This design pays part of that tax back. The discard is targeted and informed (you see the hand, you take the nonland card that hurts most), and it leaves behind a tapped Powerstone that pushes you a mana forward toward the next play. The restriction on that mana is the balancing hinge: it can't be spent to cast nonartifact spells, so the ramp is real but narrow, pointing you toward a deck already committed to colorless payoffs rather than handing you a free black follow-up. Pure discard is a tempo-negative trade in a vacuum; bolting a body-less mana rock onto it converts the tempo loss into forward motion, provided you have artifacts waiting to absorb the mana. The effect asks you to treat hand disruption and artifact acceleration as one axis rather than two competing ones, which is a tighter, more specific build than the older unconditional discard spells ever demanded. The Powerstone's spend clause is what keeps the two halves honest with each other: a discard spell that ramps into more discard would be a runaway, so the mana is walled off toward the artifact half of the deck.