Rumbling Mire

Rumbling Mire enters the battlefield tapped.
{4}{u}{b}: Monstrosity 3.
As long as Rumbling Mire is monstrous, it's a
0/0 blue and black Serpent creature. It's still a
land.
When Rumbling Mire becomes monstrous, gain control of target Equipment and attach it to
Rumbling Mire.