Dirt of Many Worms

If this land would enter the battlefield, sacrifice
two untapped lands instead. If you do, put this
land onto the battlefield. If you don't, put it
into its owner's graveyard.
{t}: Add {g}{g}.
{x}: Dirt of Many Worms becomes a legendary
green worm creature named Worm of Many
Dirts with base power and toughness X/X
until end of turn.