Everstream

{t}: Add one of any colour 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
It is an underground region, with pools of lava and
burning rock contrasting with the dark stone roof and
the water on its cavernous floor, leading out to the sea