Kyoshi, Earth Avatar

At the beginning of combat on your turn, up to one target land you control becomes an X/X Elemental creature with trample and haste until end of turn, where X is Kyoshi's power. It's still a land.
Landfall-Whenever a land enters the battlefield under your control, put a +1/+1 counter on target creature.
Obuun, Mul Draya Ancestor