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You may play a playtest card you own from outside the game this turn, and mana of any type can be spent to cast it. (In an game of Unknown event commander sealed, these are all the playtest cards you opened but aren't using in your deck.)
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.
