Activate Thermopod's second ability by sacrificing Optimus Prime, Hero, adding ({R} magic symbol) .
When Optimus Prime, Hero dies, its second ability triggers, returning it from your graveyard to the battlefield as Optimus Prime, Autobot Leader.
Activate Thermopod's second ability by sacrificing Optimus Prime, Autobot Leader, adding ({R} magic symbol) .
When Optimus Prime, Autobot Leader dies, Mikaeus triggers, returning Optimus Prime from your graveyard to the battlefield as Optimus Prime, Hero with a +1/+1 counter on it.