
Those Who Came Before — This spell costs less to cast for each historichistoricArtifacts, legendaries, and Sagas are historic. card in your graveyard. (Artifacts, legendaries, and Sagas are historic.)
Exile any number of historichistoricArtifacts, legendary cards and Sagas are historic. cards from your graveyard with total mana valuemana valueThe total amount of mana in a card's cost, ignoring colour. A card costing has mana value 4. X counts as 0 except on the stack. 30 or greater: You get an emblem with "Creatures you control have base power and toughness 9/9."
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Read from the rules text. A card that enables a keyword makes or is the thing; a card that rewards it gets better when you have it. Two cards interact when one enables what the other rewards.