Boommobile enters the battlefield, it triggers, adding ({R} magic symbol) ({R} magic symbol) ({R} magic symbol) ({R} magic symbol) or ({W} magic symbol) ({W} magic symbol) ({W} magic symbol) ({W} magic symbol) that can only be spent to activate abilities.
Activate
Meticulous Excavation by paying ({W} magic symbol) , returning
Boommobile from the battlefield to your hand.
Repeat.
Notes
Once you have infinite mana, you may activate
Boommobile's ability to deal infinite damage to any target(s).
Results
Infinite damage.
Infinite colored mana that can only be spent to activate abilities.