Activate Krenko by tapping it, creating at least five 1/1 Goblin creature tokens.
Activate Thermopod's second ability five times by sacrificing five Goblin tokens, adding ({R} magic symbol) ({R} magic symbol) ({R} magic symbol) ({R} magic symbol) ({R} magic symbol) .
Activate Aggravated Assault by paying ({3} magic symbol) ({R} magic symbol) ({R} magic symbol) , causing you to untap all creatures you control and to get an additional combat and main phase after this one.
Repeat.
If you control six or more Goblins, this combo nets infinite creature tokens.