You control at least seven other nontoken Dinosaurs.
An opponent cannot block Gishath or Hellkite Charger.
Steps
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} magic symbol) .
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} magic symbol) ({R} magic symbol) ({R} magic symbol) 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.