Activate Tree of Perdition by tapping it, swapping its toughness and an opponent's life total.
Cast Soul Immolation by paying {3}{R}{R} and choosing to blight a number of -1/-1 counters equal to an opponent's life total, dealing damage to each opponent and each opposing creature equal to the number of -1/-1 counters placed
The opponent whose life total was swapped loses the game due to having 0 or less life.

Near-infinite damage

Target opponent loses the game

Tree of Perdition

Soul Immolation

Activate Rograkh by sacrificing it.
Rograkh dies, triggering Koll, returning Rograkh from your graveyard to your hand.
Resolve the Rograkh ability, dealing 1 damage to any target.
Cast Rograkh by paying {0}.
Activate Mask of Immolation's equip ability by paying {0}, attaching it to Rograkh.
Repeat.

Infinite damage

Infinite death triggers

Infinite creature ETB

Infinite creature LTB

Infinite creature sacrifice triggers

Infinite storm count

Koll, the Forgemaster

Puresteel Paladin

Mask of Immolation

Rograkh, Son of Rohgahh

Activate Memnite by sacrificing it.
Memnite dies, triggering Koll, returning Memnite from your graveyard to your hand.
Resolve the Memnite ability, dealing 1 damage to any target.
Cast Memnite by paying {0}.
Activate Mask of Immolation's equip ability by paying {0}, attaching it to Memnite.
Repeat.

Memnite

Fighter Class

Activate Ornithopter by sacrificing it.
Ornithopter dies, triggering Koll, returning Ornithopter from your graveyard to your hand.
Resolve the Ornithopter ability, dealing 1 damage to any target.
Cast Ornithopter by paying {0}.
Activate Mask of Immolation's equip ability by paying {0}, attaching it to Ornithopter.
Repeat.

Ornithopter

Activate Paradise Mantle by paying {0}, attaching it to Fervent Champion.
Activate Fervent Champion by tapping it, adding {R}.
Activate Mask of Immolation's ability by paying {0}, attaching it to Fervent Champion.
Activate Fervent Champion's ability from Mask of Immolation by sacrificing it.
Koll triggers, returning Fervent Champion from your graveyard to your hand.
Resolve the Fervent Champion ability, dealing 1 damage to any target.
Cast Fervent Champion by paying {R}.
Repeat.

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