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Battlebond (You may pair this creature with an unpaired battle you control when either enters the battlefield. They remain paired for as long as you control both of them.)
As long as Azra Matchthrower is paired with a battle, each of those permanents has "Whenever this permanent is dealt combat damage, this permanent deals 1 damage to any target."
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.
