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Each player mills ten cards. For each player, choose a creature or planeswalker card in that player's graveyard. Put those cards onto the battlefield under your control. Then each creature you control becomes a Phyrexian in addition to its other types.
The cards you choose can be ones that were just milled or ones that were already in the graveyard.
The creatures you control will be Phyrexians until they leave the battlefield. Any of them that stops being a creature will also stop being a Phyrexian until it becomes a creature again, if applicable.
