When Nissa, Vastwood Seer enters the battlefield, you may search your library for a basic Forest card, reveal it, put it into your hand, then shuffle. Whenever a land enters the battlefield under your control, if you control seven or more lands, exile Nissa, then return her to the battlefield transformed under her owner's control.
Nissa, Sage Animist
Legendary Planeswalker — Nissa
+1: Reveal the top card of your library. If it's a land card, put it onto the battlefield. Otherwise, put it into your hand. −2: Create Ashaya, the Awoken World, a legendary 4/4 green Elemental creature token. −7: Untap up to six target lands. They become 6/6 Elemental creatures. They're still lands.
