For each permanent type, return up to one card of that type from your graveyard to the battlefield. You lose 3 life for each card returned this way. Exile Revival Experiment.
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The cards you return are chosen as Revival Experiment resolves. No player can respond to those choices.
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The permanent types are artifact, creature, enchantment, land, and planeswalker. Things like "legendary" or "snow" are supertypes, not types.