At the beginning of your combat phase, Lagomos triggers, creating a creature token.
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 token, then causing you to untap all creatures you control and to get an additional combat phase after this one. 
Repeat each combat phase.

Infinite combat damage

Infinite combat phases

Infinite death triggers

Infinite creature ETB

Infinite creature LTB

Infinite mana creatures you control can produce

Infinite creature sacrifice triggers

Infinite untap of creatures you control

Breath of Fury

Lagomos, Hand of Hatred

Cast Hatred by paying {3}{B}{B} and by paying life equal to the highest life total among your opponent, causing any other creature you control to get +X/+0 until end of turn, where X is the life paid this way.
Activate Jarad by paying {1}{B}{G} and sacrificing the creature, causing each opponent to lose life equal to the creature's power.
Each opponent loses the game due to having zero or less life.

Each opponent loses the game

Near-infinite lifeloss

Jarad, Golgari Lich Lord

Hatred

At the beginning of your upkeep, Mayael's Aria triggers.
Holding priority, cast Hatred by paying {3}{B}{B} and an amount of life equal to nineteen minus the greatest power among creatures you control.
Resolve Hatred, causing the creature who has the greatest power among creatures you control to have a power of at least nineteen until end of turn.
Resolve the Mayael's Aria trigger, causing you to put a +1/+1 counter on each creature you control, gain ten life, and win the game.

Win the game at the beginning of your next upkeep

Mayael's Aria

Declare Kediss as an attacker, choosing to attack an opponent unable to block.
Before damage, cast Hatred targeting Kediss and pay life equal to the highest life toal among your opponent.
Kediss kills the defending player.
Kediss triggers, dealing lethal damage to each other opponent.


Kediss, Emberclaw Familiar

Activate Lagomos by tapping it, searching your library for Hostility and putting it into your hand.
Activate Mind over Matter by discarding Hostility, targeting Lagomos.
Hostility triggers, shuflling it from your graveyard into your library.
Resolve the Mind over Matter trigger, untapping Lagomos.
Repeat.

Infinite self-discard triggers

Mind Over Matter

Hostility

Activate Lagomos by tapping it, searching your library for Dread and putting it into your hand.
Activate Mind over Matter by discarding Dread, targeting Lagomos.
Dread triggers, shuflling it from your graveyard into your library.
Resolve the Mind over Matter trigger, untapping Lagomos.
Repeat.

Dread

Activate Lagomos by tapping it, searching your library for Guile and putting it into your hand.
Activate Mind over Matter by discarding Guile, targeting Lagomos.
Guile triggers, shuflling it from your graveyard into your library.
Resolve the Mind over Matter trigger, untapping Lagomos.
Repeat.

Guile

Activate Lagomos by tapping it, searching your library for Ulamog and putting it into your hand.
Activate Mind over Matter by discarding Ulamog, targeting Lagomos.
Ulamog triggers, shuflling your graveyard into your library.
Resolve the Mind over Matter trigger, untapping Lagomos.
Repeat.

Ulamog, the Infinite Gyre

Activate Lagomos by tapping it, searching your library for Kozilek and putting it into your hand.
Activate Mind over Matter by discarding Kozilek, targeting Lagomos.
Kozilek triggers, shuflling your graveyard into your library.
Resolve the Mind over Matter trigger, untapping Lagomos.
Repeat.

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