Declare the creature with Breath of Fury attached and Ellivere of the Wild Court as attackers.
Ellivere of the Wild Court's first ability triggers, creating a 2/2 Cat creature token with haste due to Jinnie Fay.
Deal combat damage using the creature that has Breath of Fury attached.
Breath of Fury and Ellivere of the Wild Court's second ability triggers.
Resolve the Breath of Fury trigger, causing you to sacrifice the creature it is attached to, then attach Breath of Fury to the Cat token, then causing you to untap all creatures you control and to get an additional combat phase after this one.
Resolve the Ellivere of the Wild Court trigger, causing you to draw a card.
Repeat each combat phase.
This loop turns your attack steps into an unstoppable, self-sustaining engine by turning every extra combat into fresh fodder for your board. As Ellivere of the Wild Court swings and Jinnie Fay, Jetmir's Second leaps into action to replace any incoming Role generation with a hasty Cat token, you establish the exact piece of hardware that Breath of Fury demands. Every time your Breath of Fury-enchanted creature connects for combat damage, you sacrifice it to untap your team and chain into another combat phase, instantly moving the Aura to your newly minted Cat token to keep the momentum going. Meanwhile, Ellivere's persistent draw ability makes sure that every single one of these repeated strikes refills your hand, turning your endless onslaught of combat phases into a mountain of card advantage.