Council of Reeds
The legend rule exists to keep singleton legendaries from stacking, and every card that switches it off is really asking a different question: what happens when the thing you are not supposed to double actually wants to be doubled? Here the answer is a self-replicating combat trigger gated on noncreature spellcasting. Turn the rule off for your own creatures, then reward each turn you develop the board with instants, artifacts, or sorceries by spawning another copy of this same body, which in turn keeps generating. The two lines are built to feed each other, and the static ability is not a bonus so much as the beam holding the engine up: the moment the combat trigger makes its first copy, an unmodified legend rule would fire as a state-based action and put all but one into the graveyard, collapsing the loop before it starts. Suppress the rule and every copy stays, each new one arriving next turn ready to make another. The spellcasting condition is what shapes the shell around it. The trigger checks, as combat opens, whether a noncreature spell has already hit the stack that turn, which pushes toward a spellslinger build rather than a creature-flooded one and rewards front-loading your turn with cantrips and cheap interaction. Mirror Gallery works the same lever, converting a restriction into a payoff, but where that card is a colorless permission slip, this bundles the permission with its own reason to exist and a body that snowballs the instant you commit to casting spells.
