Destroy target Forest, green enchantment, or green planeswalker. If that permanent was a Nissa planeswalker, draw a card.
Most nonbasic lands that produce green mana arenâ€™t Forests. For example, Desert of the Indomitable isnâ€™t a Forest. Some nonbasic lands (such as Sheltered Thicket from the Amonkhet set) do have basic land types printed on the type line and may be Forests.