Chandra's Regulator

Named after a planeswalker and built to serve exactly one family of them, this is a rare case of an artifact whose top-line function keys off a single character's activations. Tick any Chandra up or down, pay one extra mana, and you copy that ability with fresh targets: a second Fireball's worth of damage, a doubled emblem, two waves of tokens off one loyalty click. The design bets everything on you running enough Chandras that the trigger fires often, a steep ask outside of dedicated planeswalker builds, so the card hedges with its second mode. The rummaging line is the floor: even with no Chandra in play, it converts a Mountain card or any spare red card in hand into a fresh draw, keeping the artifact from being dead in the games where the payoff never arrives. That split is the honest read. The loyalty-copy line is the ceiling, an explosive engine that can end a game the turn a Chandra untaps beneath it; the discard-to-draw line is why it isn't a pure build-around trap, giving the card something to do while you wait for that turn to come. Note the constraint on what it can pitch: not any flooded land, only red cards and Mountains, which quietly ties the floor to the same deck the ceiling wants. It sits in a narrow tradition of character-specific gear, permanents made to justify building around one named planeswalker rather than to stand on their own.