The Slagbelcher Caverns

Elementals you control gain "{t}: Deal damage to
each player equal to this creature's power."
Sacrifice an Artifact: Add an amount of {c} to
your mana pool equal to the converted mana
cost of the sacrificed artifact.
{x}: The Slagbelcher Caverns becomes an X/X
Elemental Artifact Creature until end of turn. It
is still a land.