Volyra, Mother of Thornhides

Whenever a land enters the battlefield under your control, if it entered tapped, untap it.
Landfall —Whenever a land enters the battlefield under your control, create an X/X green Elemental creature token with trample and, "This creature's power and toughness are each equal to the number of lands you control."
{t}: Add {g} to your mana pool for each other Elemental you control.