Rassilon, the War President

Impulse-draw engines usually stop at the draw: you exile a card each upkeep and get a single window to play it before it vanishes. This one strips the clock entirely. The exiled cards stay castable for as long as they sit in exile, so the pile deepens turn over turn into a growing pool of options rather than a use-it-or-lose-it flip. What sharpens the math is that noncreature spells cast from that pool gain conspire, converting the exile zone from a hand-substitute into a doubling chamber: tap two same-colored creatures and any removal spell, counterspell, or ritual that landed in exile becomes two of itself, with fresh targets for the copy. The copy costs no card and no additional life, since the two life is bled off at upkeep to fuel the exile in the first place, not paid again when you cast. That upkeep drain is the counterweight, and it is relentless: you lose two a turn whether the exiled card ever matters, which pushes the build toward tempo and permission rather than a long grind. The conspire line also quietly rewards a wide, color-dense board, because the tap cost wants two untapped bodies sharing a color with the spell; a table of mono-color tokens does work a fistful of counterspells cannot. It is a Dimir engine that turns your deck's every future draw into a standing resource and every noncreature exile into a potential fork.