Water Arena

{t}: Add 1 of any colour or {u}{u} 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
This arena is fought completely underwater. Players
can resupply oxygen by swimming through underwater
air bubbles located in the center or swim to the surface
to catch some air