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Whenever you roll a diedieA creature dies when it goes from the battlefield to a graveyard. Being exiled or returned to hand is not dying., you may reveal the top card of your library. Do this only once each turn. Whenever you reveal a card with mana valuemana valueThe total amount of mana in a card's cost, ignoring colour. A card costing 
has mana value 4. X counts as 0 except on the stack. less than the result this way, you may exile it. If you do, you may play it this turn.
Hover an underlined rule to see what it means.
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.
