Grumm, Deep Forest Dweller

{t}: Add {b}{g} to your mana pool, use this mana
only to cast Goblin creatures or activate the
abilities of Goblin creatures.
Goblins you control have "{b}{g}: Regenerate."
{r}{r}{r}{t}: Search your library for a Goblin
creature and put it onto the battlefield tapped.
"Not dead, just sleeping" -Grumm, Deep
Forest Dweller