Declare Gishath and Hellkite Charger as attackers, triggering Hellkite Charger's ability.
Holding priority, activate Phyrexian Altar seven times by sacrificing seven other nontoken Dinosaurs, adding {5}{R}{R}.
When the Dinosaurs die, Mortuary triggers that many times, putting the Dinosaurs on top of your library from your graveyard.
Resolve the Hellkite Charger trigger, causing you to pay {5}{R}{R} to untap all attacking creatures you control and to get an additional combat phase after this one.
Deal combat damage to an opponent using Gishath.
Gishath triggers, causing you to reveal the top seven cards of your library and put all Dinosaurs revealed this way onto the battlefield.
Repeat each combat phase.

Infinite combat damage

Infinite combat phases

Infinite death triggers

Infinite creature ETB

Infinite creature LTB

Infinite creature sacrifice triggers

Gishath, Sun's Avatar

Mortuary

Hellkite Charger

Phyrexian Altar

Declare Gishath and Hellkite Charger as attackers, triggering Hellkite Charger's ability.
Holding priority, activate Thermopod's second ability seven times by sacrificing seven other nontoken Dinosaurs, adding seven {R}.
When the Dinosaurs die, Mortuary triggers that many times, putting the Dinosaurs on top of your library from your graveyard.
Resolve the Hellkite Charger trigger, causing you to pay {5}{R}{R} to untap all attacking creatures you control and to get an additional combat phase after this one.
Deal combat damage to an opponent using Gishath.
Gishath triggers, causing you to reveal the top seven cards of your library and put all Dinosaurs revealed this way onto the battlefield.
Repeat each combat phase.

Thermopod

Deal combat damage to an opponent using Gishath.
Gishath triggers, causing you to reveal the top seven cards of your library and put all Dinosaurs revealed this way onto the battlefield.
Move to your postcombat main phase.
Activate Phyrexian Altar five times by sacrificing five other nontoken Dinosaurs, adding {3}{R}{R}.
When the Dinosaurs die, Mortuary triggers that many times, putting the Dinosaurs on top of your library from your graveyard.
Activate Aggravated Assault by paying {3}{R}{R}, causing you to untap all creatures you control and to get an additional combat and main phase after this one.
Repeat.

Infinite mana creatures you control can produce

Infinite untap of creatures you control

Aggravated Assault

Deal combat damage to an opponent using Gishath.
Gishath triggers, causing you to reveal the top seven cards of your library and put all Dinosaurs revealed this way onto the battlefield.
Move to your postcombat main phase.
Activate Thermopod's second ability five times by sacrificing five other nontoken Dinosaurs, adding {R}{R}{R}{R}{R}.
When the Dinosaurs die, Mortuary triggers that many times, putting the Dinosaurs on top of your library from your graveyard.
Activate Aggravated Assault by paying {3}{R}{R}, causing you to untap all creatures you control and to get an additional combat and main phase after this one.
Repeat.

Combos with "Gishath, Sun's Avatar"