The "legend rule" doesn't apply to Slivers you control.
Each Sliver creature card in your graveyard has encore (, Exile this card from your graveyard: For each opponent, create a token copy that attacks that opponent this turn if able. They gain haste (This creature can attack, and as soon as it comes under your control.). Sacrifice them at the beginning of the next end step. Activate only as a sorcery.), where X is its mana value. Encore (, Exile this card from your graveyard: For each opponent, create a token copy that attacks that opponent this turn if able. They gain haste (This creature can attack, and as soon as it comes under your control.). Sacrifice them at the beginning of the next end step. Activate only as a sorcery.)
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