Centralia, Land of Antiquity

Centralia, Land of Antiquity enters the
battlefield tapped unless you control two or more
basic lands.
{t}: Add {w} or {g} to your mana pool.
{t}: Put a flood counter on Centralia, Land of Antiquity. Put the top card of each player's
library into the graveyard.
{t}: Remove X flood counters from Centralia,
Land of Antiquity. Add {x} to your mana pool.