Prophetess of Creation (U) (BP08-U03EN) [Alterchaotica]

When playing this card, banish 10 cards with different base costs ranging from 1 to 10 from your cemetery: This card costs 10 less to play.
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Ward. Aura.
This card can't be destroyed by abilities. (It can still be destroyed by ability damage.)
[Act] Discard this card: Draw a card. Discard a card.