Dark Fortress - Marvel Super Heroes (Rare) [MSH-264]

Dark Fortress is a colourless-friendly land from Marvel Super Heroes that taps for {C} with no restrictions, or for {B} or {R} under certain conditions. That second ability only works if the land just entered the battlefield or if you control a basic land, so it isn't a free pair of coloured sources once your basics get removed or sacrificed. It slots into Rakdos decks that want fixing early but can live with colourless mana in the late game, particularly builds that run some basics to keep the condition active. Worth noting it won't bail you out in basic-less lands decks or after board wipes that clear your basic lands, so plan your mana base with that in mind.