Omnath, Locus of Life

When Omnath, Locus of Life enters the battlefield, put a +1/+1 counter on each land you control.
Landfall—Whenever a land enters the battlefield,
put a +1/+1 counter on that land, then
proliferate.
{r}{r}{g}{g}, {t}: Lands you control become red
and green Elemental creatures with base power
and toughness 5/5 until end of turn. They're still
lands.