Timely Interference

Strip it down and the base mode is a one-mana cantrip that shaves a point of power off an attacker, which reads like a rounding error until you set it against the whole family of blue tricks that replace themselves. The -1/-0 rarely swings combat by itself, but it lets a smaller blocker trade up or survive, and the draw means the intervention costs no card. What justifies the second color is the kicker: pay the and you bolt on a compulsion, forcing the target to block this turn if it can. That clause is quiet tempo engineering. You cannot dictate what it blocks (the defending player still assigns blockers), but you can pull a creature out of a passive posture, dragging a held-back blocker into combat where the -1/-0 might tip the trade, or committing an evasive attacker to a fight on the ground. Splitting the effect across a multicolor kicker keeps the plain half castable in mono-blue while reserving the full package for an Izzet commitment, a way of pricing the aggressive ceiling without locking the card out of decks that only ever want the cantrip. The ambition here is small by design: smooth the combat math, keep the hand full at instant speed, and leave a red-inflected upside for the decks willing to reach for it.