Slugma

You may cast Slugma from your graveyard by sacrificing a Mountain rather than paying its mana cost.
At the beginning of your upkeep, sacrifice this creature unless you pay {r}.
Slugma can't have stun counters placed on it.
Last strike (This creature deals combat damage after creatures without last strike.)
{r}{r}, {t}: Slugma deals damage equal to its total power and toughness to target attacking or blocking creature.