Sunken Cave City

{t}: Add {c}.
{1} {t}: Tap an Adventurer you control. You get a number of Treasure tokens equal to half their Toughness, rounded up.
If you have 10 or more Treasure tokens, sacrifice
Sunken Cave City and put a +1/+1 counter on
each Adventurer you control. (Adventurers are creatures with the subtype Warrior, Rogue, Wizard,
Monk, and/or Cleric.)