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Each player may discard their hand and draw cards equal to the greatest 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 a commander they own on the battlefield or in the command zonecommand zoneThe area where your commander waits before you cast it, and where it may return instead of going to the graveyard, exile, your hand or library..
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.
