Ashaya, Soul of the Wild (PZNR 179p)

Legendary Creature — Elemental • Mana cost: {3}{G}{G} • Zendikar Rising Promos • Mythic

Ashaya's power and toughness are each equal to the number of lands you control.
Nontoken creatures you control are Forest lands in addition to their other types. (They're still affected by summoning sickness.)

Illustrated by Chase Stone.