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At the beginning of your end step, two target players each reveal the top card of their library. They each lose life equal to the 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. of the card revealed by the other player. Then they each put the card they revealed into their hand.
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.
