The Mighty Forest

{t}: add {g} to your mana pool
{t}: add a counter to The Mighty Forest
{g}{g} {t}: Add one {g} to your mana pool for each counter on The Mighty Forest.
{g}{g} {t}: Remove {x} counters from The Mighty Forest: Add {x} in any combination to your mana pool. Use this mana only on spells that cost {x}