Arcane Signet

Signet mana without the color commitment. The original Guildpact signets paid you back two mana of a fixed pair for a one-mana investment, a fine deal in a two-color world but a straitjacket the moment your deck ran three colors or more. This one strips the fixed pair entirely: it costs two, taps for one, and reads your commander's color identity to decide what "any color" means. That last clause is the whole trick. A rock that fixes for exactly the colors you can play, no more and no less, only functions in a format where a designated commander defines your legal palette; it is built for a singleton format's rules rather than adapted to them. The result is that it slots into a two-color deck and a five-color deck with identical text, doing the fixing job that would otherwise demand a stack of narrower rocks or a shakier manabase. It ramps the same way a Signet does: a net gain of one mana that smooths your curve and comes online early. What separates it from its predecessors is not speed but total consistency, since a gold-color deck never draws the wrong half of a pair. That reliability, more than raw acceleration, is why it reads less like a card designed for a set than a piece of format infrastructure.