Volcano

{t}: Add {r} to your mana pool
{4}{t}: Choose any number of players and/or permanents that have counters on them, then
remove one of each kind of counter that are
already there on these players or permanents
Lava flowing in this region is dangerous to walk near,
and it overflows at night time causing some changes in
the layout. You can find explosive rocks in some areas
which will react to enough damage