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CompanionCompanionIf your starting deck meets this card's condition, you may keep it outside the game as your companion and pay 
once to put it into your hand. — Your starting deck contains only cards with even mana valuesmana valuesIf this card is your chosen companion, you may put it into your hand from outside the game for as a sorcery.. (If this card is your chosen companion, you may put it into your hand from outside the game for as a sorcery.)
When Gyruda enters, each player mills four cards. Put a creature card with an even 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. from among the milled cards onto the battlefield under your control.
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.
