Deal damage to Mogg Maniac.
Mogg Maniac and Blazing Sunsteel trigger.
Resolve the Mogg Maniac trigger, dealing damage to an opponent
Resolve the Blazing Sunsteel trigger, dealing damage to Mogg Maniac.
Repeat from step 2.

Infinite damage

Blazing Sunsteel

Mogg Maniac

Deal damage to Mogg Maniac.
Mogg Maniac triggers, dealing damage to an opponent.
Guilty Conscience triggers, dealing damage to Mogg Maniac.
Repeat from step 2.

Infinite damage to target opponent

Guilty Conscience

Deal damage to Mogg Maniac.
Mogg Maniac and Fiendlash trigger.
Resolve the Mogg Maniac trigger, dealing damage to an applicable target.
Resolve the Fiendlash trigger, targeting you, but dealing damage to Mogg Maniac instead due to Pariah's Shield.
Repeat from step 2.

Fiendlash

Pariah's Shield

Declare any creature as an attacker. Dawnsire triggers, dealing 100 damage to  Mogg Maniac.
Mogg Maniac triggers, dealing 100 damage to target opponent.

Near-infinite damage to target opponent

Dawnsire, Sunstar Dreadnought

Deal damage to Mogg Maniac.
Mogg Maniac and Repercussion trigger.
Resolve the Mogg Maniac trigger, dealing damage to an applicable target.
Resolve the Repercussion trigger, dealing damage to Mogg Maniac instead of you due to Pariah.
Repeat from step 2.

Repercussion

Pariah

Cast Volcano Hellion by paying {2}{R}{R}.
When Volcano Hellion enters, it triggers, dealing an arbitarily large amount of damage to you and a creature. The damage that would be dealt to you is dealt to Mogg Maniac instead due to Pariah.
Mogg Maniac triggers, dealing an arbitrarily large amount of damage to an applicable target.

Volcano Hellion

Cast Wheel of Misfortune by paying {2}{R}, choosing an arbitrarily large number and having Wheel of Misfortune deal that much damage to Mogg Maniac instead of you due to Pariah if you chose the largest number.
Mogg Maniac triggers, dealing that much damage to an applicable target.

Wheel of Misfortune

Cast Volcano Hellion by paying {2}{R}{R}.
Volcano Hellion enters the battlefield, triggering itself.
Holding priority, activate General's Regalia by paying {3}, choosing to redirect the next damage Volcano Hellion does to you to Mogg Maniac instead.
Resolve Volcano Hellion's ability, dealing an arbirarily large amount of damage to Mogg Maniac.
Mogg Maniac triggers, dealing an arbitarily large amount of damage to target opponent.

General's Regalia

Cast Angel's Grace by paying {W}.
Cast Volcano Hellion by paying {2}{R}{R}.
Volcano Hellion enters the battlefield, dealing an arbitrarily large amount of damage to Mogg Maniac and you, with Angel's Grace causing your life total to become one instead.
Mogg Maniac triggers, dealing an arbitarily large amount of damage to target opponent.

Angel's Grace

Activate Tree of Perdition, exchanging target opponent's life total with Tree of Perdition's toughness.
Cast Blasphemous Act, dealing thirteen damage to all creatures.
Mogg Maniac triggers, dealing thirteen damage to target opponent.

Target player takes a lethal amount of damage

Tree of Perdition

Blasphemous Act

Cast Volcano Hellion by paying {2}{R}{R}.
Volcano Hellion enters the battlefield, dealing an arbitrarily large amount of damage to Mogg Maniac and you.
You do not lose the game due to having zero or less life due to Platinum Angel.
Mogg Maniac triggers, dealing an arbitarily large amount of damage to target opponent.

Platinum Angel

Cast Volcano Hellion by paying {2}{R}{R}.
Volcano Hellion enters the battlefield, dealing an arbitrarily large amount of damage to Mogg Maniac and you.
Your life total does not change due to Platinum Emperion.
Mogg Maniac triggers, dealing an arbitarily large amount of damage to target opponent.

Platinum Emperion

Activate Tree of Perdition, exchanging target opponent's life total with Tree of Perdition's toughness.
Cast Shivan Meteor for {3}{R}{R}, dealing thirteen damage to Mogg Maniac.
Mogg Maniac triggers, dealing 20 damage to target opponent.

Shivan Meteor

Activate Tree of Perdition, exchanging target opponent's life total with Tree of Perdition's toughness.
Cast Into the Maw of Hell for {4}{R}{R}, destroying target land and dealing thirteen damage to Mogg Maniac.
Mogg Maniac triggers, dealing 20 damage to target opponent.

Into the Maw of Hell

Earthbend a basic land you control.
Cast Legolas's Quick Reflexes by paying {G}, targeting the earthbent land.
Activate Earthcraft by tapping the earthbent land, targeting the earthbent land.
The land triggers, causing it to deal damage equal to its power to Mogg Maniac.
Mogg Maniac triggers, dealing that much damage to an applicable target.
Resolve the Earthcraft trigger, untapping the earthbent land.
Repeat from step 3.

Combos with "Mogg Maniac"