Painter's Servant

The most consequential word here is "all." When it enters, every card not already on the battlefield, every spell, and every permanent gains the chosen color: not your stuff, not a handful of it, the entire game state at once. That global recoloring turns a 1/3 Scarecrow into a combo enabler whose payoffs live in cards that ask about color rather than read it off the cost. Name blue, and Grindstone mills an entire library in one activation, because every card now shares a color with whatever was just revealed and the loop never breaks. Name any color and protection from that color quietly becomes protection from everything, while a mono-color edict or a color-hosed wrath turns universal. The card cares nothing about combat, about its body, about being a creature at all beyond the requirement that it resolve and stick. Its static ability applies the instant the replacement effect picks a color, so the combo can fire the same turn the mana is there; nothing has to wait. The cost it does carry is fragility and commitment: it dies to any removal, and the color is locked at entry rather than a knob you can turn again. This is a deep rules-text lever housed in an unassuming frame, a one-card argument that color is not an immutable property a card is born with but a state you can overwrite. Few designs reach so far into the comprehensive rules from so quiet a body.