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 (Extended Art) [Commander Masters] | Jack's On Queen](http://jacksonqueen.ca/cdn/shop/files/bcce563e-bfe8-51d7-8c4b-d0ae059446a6.png?v=1724939010)
