An opponent cannot block and kill creatures you control.
You have at least four experience counters.
Steps
Declare Otharri as an attacker.
Otharri triggers, causing you to get an experience counter and create at least five 2/2 Rebel creature tokens that are tapped and attacking.
Move to your postcombat main phase.
Activate Thermopod five times by sacrificing five Rebels, adding ({3} 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.