Goblin Excavator

{t}, Sacrifice a Mountain: Add three mana
in any combination of {b} and/or {r}.
"Covered in soot, the goblin excavator's grin is
as bright as the magical stones he unearths.
'Blast it, find it, and then onto the next one!' is
more than just his motto—it's a way of life beneath the Emberfang Peaks."