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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 odd mana valuesmana valuesIf this card is your chosen companion, you may put it into your hand from outside the game for as a sorcery. and land cards. (If this card is your chosen companion, you may put it into your hand from outside the game for as a sorcery.)
If a source you control with an odd 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. would deal damage to a permanent or player, it deals doubledoubleAll spells and abilities cast, activated, or triggered by you are copied. Mana abilities produce twice as much mana. that damage to that permanent or player instead.
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.
