Pull from Tomorrow

The rate here is close to as clean as blue's deep-draw effects get: buys you X cards at instant speed, with the two-mana surcharge as the entire fixed cost and no conditional strings on the back end. Blue's history of scaling card draw is a history of surcharges and constraints layered on top: Stroke of Genius wants X plus three and hands a card to a target of your choice, Sphinx's Revelation ties the dig to lifegain, and much of the older bulk-draw suite lived at sorcery speed precisely because instant-speed card flooding is dangerous to give away. This asks for nothing beyond X and the two blue pips, and it resolves at instant speed, so it can hover over an opponent's end step and convert a passed turn into a fistful of cards with no exposure on your own. The mandatory discard is the friction that pays for the openness: there is no mode that lets you keep everything, and at the bottom end it bites. Cast for X=1 and you draw one, discard one, and break even on hand size while spending the spell itself, a net loss. The card wants a meaningful X, where ditching your worst card is upside wearing a tax's clothes. Pay enough into it and the discard vanishes into the noise, refueling an empty hand as readily as it tops off a full one.