Burrowing Bulette

Menace. Rampage 2. Riot. Trample.
Mount 4 (Tap another creature card you control
with power 4 and attach it to Burrowing Bulette. That
creature becomes a rider. As long as the rider remains
tapped, it and this creature are on the battlefield, this
is a mounted unit)
If this is a mounted unit, this creature gets:
Burrow--{r}{r/g}{g},{t}: Destroy target land.