River's Grasp

Most hybrid spells treat their two colors as interchangeable wallets: either source casts the same effect, and pilots gain nothing extra for running both. This one reads the actual mana spent and scales its output to match. Pay the hybrid pip with blue and the spell bounces a creature; pay it with black and it becomes a targeted, you-pick discard. The clever clause is the combined outcome. To get both halves at once, you cannot lean on the single hybrid symbol (one pip is one mana); you have to feed it blue and supply the second color from the generic portion of the cost, spending one blue and one black across the four mana total. That requirement is the real ask of the design: not just both colors in the deck list, but the discipline to assemble one of each at the moment of casting. The reward is a genuine two-for-one, bounce plus hand disruption, that a Dimir attrition shell wants and that a mono-colored pilot can never put together. It is a rare case where the spell pays out for running both colors inside its own resolution rather than only in the deckbuilding around it, converting the usual complaint about hybrid flexibility (you pay for options you never use) into the lever that unlocks the full effect.