Activate Goblin Warrens by paying ({2} magic symbol) ({R} magic symbol) and sacrificing two Goblins, creating three 1/1 Goblin creature tokens.
When the Goblins enter the battlefield, Mana Echoes triggers three times, adding ({C} magic symbol) ({C} magic symbol) ({C} magic symbol) for each Goblin you control.
Activate Thermopod's second ability by sacrificing a Goblin, adding ({R} magic symbol) .