The “legend rule” doesn't apply to Slivers you control.
Each Sliver creature card in your graveyard has encore {X}, where X is its mana value.
Encore {5} ({5}, Exile this card from your graveyard: For each opponent, create a token copy that attacks that opponent this turn if able. They gain haste. Sacrifice them at the beginning of the next end step. Activate only as a sorcery.)
![Sliver Gravemother (Display Commander) (Foil Etched) [Commander Masters]](http://www.cosmicgames.com/cdn/shop/files/e544681e-b39b-51db-93e7-878fbdc4c609.png?v=1736539127&width=1445)
