Helera, Plane Shaper

Landfall -Whenever a basic land enters the battlefield under your control, put a counter of the land type on a opponent land, it
become also this type of land.
{w}{u}{b}{r}{g},Target land you control becomes an X/X Elemental creature with landwalk of it's type, where X is the number of lands of that type on the battlefield. It's still a land.