Coupling Minewurms

Trample
When Coupling Minewurms enters the battlefield, create a 5/5 green Wurm creature token with trample if you cast it from your hand. Otherwise, populate.
Burrow {2}{r}{g}{w}({2}{r}{g}{w}: Exile this creature
and create a 0/1 colorless Sand creature token. Return it to the battlefield at the beginning of the next end step.)