Infinite combat damageInfinite combat phasesInfinite death triggersInfinite creature ETBInfinite creature LTBInfinite mana creatures you control can produceInfinite creature sacrifice triggersInfinite untap of creatures you control
How it works
Declare Olivia and the creature with Breath of Fury attached as attackers.
Olivia triggers, returning a creature card that has haste from your graveyard to the battlefield tapped and attacking.
Deal combat damage using the creature that has Breath of Fury attached.
Breath of Fury triggers, causing you to sacrifice the creature it is attached to, then attach Breath of Fury to the creature Olivia returned, then causing you to untap all creatures you control and to get an additional combat phase after this one.
Repeat each combat phase.
This loop relies on Olivia, Crimson Bride using her flying and haste to repeatedly pull hasty threats from the graveyard into an endless stream of extra combats. When you enchant one of your attackers with Breath of Fury, dealing combat damage to a player lets you sacrifice that creature to restart the phase and move the Aura onto Olivia's newly resurrected target. Because Olivia triggers anew on each additional combat phase, you can loop this process indefinitely to generate endless death triggers, enter-the-battlefield triggers, and total combat dominance.