Sandwurm

When Sandwurm comes into play bury target
creature unless its controller pays {p/r}
{ut}: Add one mana of any color a land you control
could produce.
{ut}{g}{w}: flip a coin, put a copy of sandwurm into
play under your control if you win the flip.
Threshold: Sandwurm gets +0/+1 for each plains
in play.