Azra Matchthrower (Unknown Event CR04a) - Common Magic: The Gathering Card

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."