({R} magic symbol) ({R} magic symbol) ({R} magic symbol) at most available.
Steps
Activate Thermopod's second ability by sacrificing Squee, adding ({R} magic symbol) .
Cast Squee from your graveyard by paying ({R} magic symbol) ({R} magic symbol) .
Runaway Steam-Kin triggers, putting a +1/+1 counter on it.
If Runaway Steam-Kin has three or more +1/+1 counters on it, activate it by removing three +1/+1 counters on it, adding ({R} magic symbol) ({R} magic symbol) ({R} magic symbol) .