Raging Oasis

Trample (This creature can deal excess combat
damage to the player or planeswalker it's attacking.)
{t}: Add {g}{g}{g} to your mana pool. Activate this
ability only if you control a Desert.
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"Everywhere, the will of the Maha is made manifest.
Beware to any who does not pay heed to her
warnings." - Pharaqan, the Terramagus