Cast Devastating Onslaught by paying {10}{R}, creating five token copies of Terror the Peaks.
The Terror of the Peaks tokenss enter the battlefield, triggering the nontoken Terror of the Peaks five times, and each Terror of the Peaks token four times.
Resolve all Terror of the Peaks triggers, dealing 125 damage divided among a maximum of 25 targets.

Near-infinite damage

Devastating Onslaught

Terror of the Peaks

Cast Devastating Onslaught by paying {2}{R}, targeting an artifact or creature you control.
Holding priority, cast Dualcaster Mage by paying {1}{R}{R}.
When Dualcaster Mage enters the battlefield, it triggers, copying Devastating Onslaught, targeting Dualcaster Mage.
Resolve the copy of Devastating Onslaught, creating a token copy of Dualcaster Mage.
Repeat from step 3.

Infinite creature ETB

Infinite creature tokens with haste

Infinite magecraft triggers

Dualcaster Mage

Cast Devastating Onslaught by paying {6}{R}, creating six token copies of Exalted Sunborn.
Whenever you create one or more tokens until the beginning of your end step, you will instead create 128 times as many of those tokens due to the Exalted Sunborns.

Infinite copies of all tokens you control

Exalted Sunborn

Cast Mana Geyser by paying {3}{R}{R}, adding {R} for each tapped land your opponents control.
Cast Devastating Onslaught by paying {4}{R}, creating two token copies of Pinnacle Monk with haste.
When the Pinnacle Monk tokens enter, they trigger, returning Mana Geyser and Devastating Onslaught from your graveyard to your hand.
Repeat.

Infinite creature LTB

Infinite creature sacrifice triggers

Infinite death triggers

Infinite storm count

Infinite red mana

Mana Geyser

Pinnacle Monk // Mystic Peak

Cast Devastating Onslaught by paying {10}{R}, creating five token copies of Scourge of Valkas.
The five Scourge of Valkas tokens enter the battlefield, triggering each Scourge of Valkas five times.
Resolve all Scourge of Valkas triggers, dealing at least 180 damage divided among a maximum of 30 targets.

Scourge of Valkas

Cast Devastating Onslaught by paying its mana cost targeting the creature that can recur spells.
When you cast that spell, Spinerock Tyrant triggers, copying Devastating Onslaught and choosing Spinerock Tyrant as its target.
Resolve the copy of Devastating Onslaught, creating a Spinerock Tyrant token.
Resolve the original Devastating Onslaught, creating a token copy of the spell recursion creature.
When that token enters, it triggers, returning Devastating Onslaught from your graveyard to your hand.
Repeat from step 1 one additional time, resulting in a total of five Spinerock Tyrants.
Cast the spell that creates a Treasure token by paying its mana cost, targeting any creature.
Each copy of Spinerock Tyrant triggers, copying that spell once for each Spinerock Tyrant you control.
Resolve all copies of that spell, creating at least one Treasure token each time.
Activate those Treasure tokens by tapping and sacrificing them, adding one mana per Treasure.
Cast Devastating Onslaught by paying its mana cost targeting the spell recursion creature.
When you cast that spell, each copy of Spinerock Tyrant triggers, copying Devastating Onslaught once for each Spinerock Tyrant and choosing the spell recursion creature once and Spinerock Tyrant as each additional spell's target.
Resolve all copies of that spell, creating two copies of the spell recursion creature and additional copies of Spinerock Tyrant.
When the first spell recursion creature token enters, it triggers, returning the spell that creates Treasure from your graveyard to your hand.
 When the second spell recursion creature token enters, it triggers, returning Devastating Onslaught from your graveyard to your hand.
Repeat from step 7.

Infinite Treasure tokens

Infinite colored mana

Infinite copies of creatures you control

Infinite artifact ETB

Infinite artifact LTB

Infinite artifact sacrifice triggers

Infinite artifact tokens

Instant or Sorcery that Targets a Creature and Creates Treasure

Creature that Returns an Instant or Sorcery from Graveyard to Hand on Entering

Spinerock Tyrant

Cast Devastating Onslaught by paying {2}{R}, targeting a creature you control.
Holding priority, cast Naru Meha by paying {2}{U}{U}.
When Naru Meha enters the battlefield, it triggers, copying Devastating Onslaught, targeting Naru Meha.
Resolve the copy of Devastating Onslaught, creating a token copy of Naru Meha.
Put either Naru Meha into your graveyard due to the legend rule.
Repeat from step 3.

Naru Meha, Master Wizard

Cast Devastating Onslaught by paying {6}{R}, creating three token copies of Biovisionary with haste.
At the beginning of your end step, each Biovisionary triggers from their own abilities, and each Biovisionary token triggers from the ability given to it from Devastating Onslaught.
Resolve the nontoken Biovisionary's trigger, causing you to win the game.

Combos with "Devastating Onslaught"