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] | Grognard Games](http://grognardgames.com/cdn/shop/files/ca55a2b4-f53a-4c76-bd28-8ce49108a322.png?v=1776031578)
