Sliver Gravemother Fallout A Traditional Foil Land replaces

A Traditional Foil Land replaces the basic land in 20% of Set Boosters and a Foil-Stamped Signature Art Card replaces the Art Card in 10% of Set Boosters

Whenever another legendary permanent you control enters

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Whenever a land with the same name as the exiled card is tapped for mana

If one or more tokens would be created

Sliver Gravemother Fallout A Traditional Foil Land replacesThe '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.)