Xenomorph Matriarch

Replaces Sliver Gravemother

The "legend rule" doesn't apply to Xenomorphs you control.
Each Xenomorph 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.)