Tunneling Troglodyte

Cavewalk (If both you and the defending player
control a cave, Tunneling Troglodyte cannot be blocked)
{x}{r/g}{r/g}{t} Create X cave tokens under any number
of players' control with "{4}{t} target creature
cannot be blocked by creatures controlled by a
player that controls a cave until end of turn".
Tunneling Troglodyte gets +1/+1 for each cave in
play.