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Rulings
Brood Keeper’s ability triggers both whenever an Aura enters the battlefield attached to Brood Keeper and whenever an Aura on the battlefield attached to a different object becomes attached to Brood Keeper.
If an Aura becomes attached to Brood Keeper that causes another player to gain control of it, that player will control the triggered ability that creates a Dragon.
If an Aura becomes attached to Brood Keeper that causes another player to gain control of it, that player will control the triggered ability that creates a Dragon.
Rulings
Brood Keeper’s ability triggers both whenever an Aura enters the battlefield attached to Brood Keeper and whenever an Aura on the battlefield attached to a different object becomes attached to Brood Keeper.
If an Aura becomes attached to Brood Keeper that causes another player to gain control of it, that player will control the triggered ability that creates a Dragon.
If an Aura becomes attached to Brood Keeper that causes another player to gain control of it, that player will control the triggered ability that creates a Dragon.
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