Breath of Fury + Treasury Thrull + Aluren + Urabrask the Hidden

Breath of Fury

Treasury Thrull

Aluren

Urabrask the Hidden

How it works

1. Declare Treasury Thrull and the creature with Breath of Fury attached as attackers.
2. Treasury Thrull triggers, returning a creature card with mana value 3 or less from your graveyard to your hand.
3. Cast the creature by paying 0 due to Aluren.
4. Deal combat damage using the creature that has Breath of Fury attached.
5. Breath of Fury triggers, causing you to sacrifice the creature it is attached to, then attach Breath of Fury to the creature with mana value 3 or less, then causing you to untap all creatures you control and to get an additional combat phase after this one.
6. Repeat each combat phase.

This engine sets up an infinite loop of combat phases by leveraging Breath of Fury to continuously sacrifice and move its Aura to a fresh threat. Aluren makes this possible by letting you instantly cast low-cost creatures for zero mana from your hand whenever you need a new vessel for the Aura, while Urabrask the Hidden ensures those freshly deployed creatures immediately gain haste to join the next attack. Meanwhile, Treasury Thrull works behind the scenes on every attack, recurring those sacrificed or discarded low-value cards right back to your hand to keep the cycle fully fueled.