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 has 3 listed printings; the most valuable is the Extended Art printing from CMM at US$29.75 on TCGplayer's market price. Prices below are the cheapest in-stock listing in the United States.
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