Cast Apex Altisaur by paying {7}{G}{G}.
When Apex Altisaur enters, its first ability triggers.
Holding priority, cast Heroic Intervention by paying its mana cost, giving creatures you control indestructible until end of turn.
Resolve the Apex Altisaur trigger, causing it to fight a creature you don't control.
If the opposing creature dealt damage to Apex Altisaur, Apex Altisaur's second ability and Wrathful Raptors trigger.
Resolve the Wrathful Raptors trigger, dealing damage to any opponent.
Resolve the Apex Altisaur trigger, causing it to fight a creature you don't control.
Repeat from step 4 until your opponents control no creatures. If they happen to control an indestructible creature with power above 0, this loop can be done infinitely.

Destroy all creatures opponents control

Near-infinite damage

Apex Altisaur

Wrathful Raptors

Heroic Intervention

Give Red Hulk and Screaming Nemesis indestructible using Heroic Intervention.
Deal damage to Red Hulk.
Red Hulk triggers, putting a +1/+1 counter on it and dealing damage to Screaming Nemesis.
Screaming Nemesis triggers, dealing damage to Red Hulk.
Repeat from step 3.

Infinite +1/+1 counters on a creature

Infinite damage to one opponent

Red Hulk

Screaming Nemesis

Cast Heroic Intervention by paying {1}{G}, giving permanents you control hexproof and indestructible until end of turn.
Cast Chain of Acid paying {3}{G} targeting a permanent you control.
Resolve Chain of Acid, failing to destroy the indestructible permanent you control and copying Chain of Acid targeting the same permanent.
Twinning Staff triggers, copying Chain of Acid an additional time, targeting a noncreature permanent an opponent controls.
Resolve a Chain of Acid copy, destroying the permanent an opponent controls; that opponent may copy the spell but cannot target your permanents.
Repeat from step 3.

Destroy all noncreature permanents opponents control

Infinite magecraft triggers

Mass Land Denial

Twinning Staff

Chain of Acid

Cast Heroic Intervention by paying {1}{G}, giving permanents you control hexproof and indestructible until end of turn.
Activate Hammerfist Giant by tapping it, dealing 4 damage to each creature without flying and each player.
Cacophodon triggers, untapping Hammerfist Giant.
Repeat from step 2.

Infinite damage

Cacophodon

Hammerfist Giant

Cast Heroic Intervention by paying {1}{G}, giving permanents you control hexproof and indestructible until end of turn.
Activate Krark-Clan Shaman by sacrificing an artifact, dealing 1 damage to each creature without flying.
Sonic's second ability triggers for each creature you control with haste or flash that was dealt damage, creating that many tapped Treasure tokens.
Repeat from step 2.

Combos with "Heroic Intervention"