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Converted Mana Cost:
(Phyrexian Green can be paid with either Green or 2 life.)
1Phyrexian Green, Tap, Sacrifice a creature: Search your library for a creature card with converted mana cost equal to 1 plus the sacrificed creature's converted mana cost, put that card onto the battlefield, then shuffle your library. Activate this ability only any time you could cast a sorcery.