Tana's Vengeance

Destroy target artifact you don't control. An
artifact destroyed this way can't be regenerated.
Create X 1/1 green Saproling creature tokens,
where X is the total mana value of each artifact
destroyed this way.
Overload {4}{r}{g} (You may cast this spell for its
overload cost. If you do, change its text by replacing
all instances of "target" with "each".)
"Feed us, Tana. Feed us 'til we're big and strong."