Nissa, Vastwood Seer (SDCC 2015 Exclusive) #189

When Nissa, Vastwood Seer enters the battlefield, you may search your library for a basic Forest card, reveal it, and put it into your hand, then shuffle your library. Whenever a land enters the battlefield under your control, if you control seven or more lands, exile Nissa, then return her onto the battlefield transformed under her owner's control.

[+1]: Reveal the top card of your library. If it's a land, put it onto the battlefield. Otherwise, put it into your hand. [-2]: Put a legendary 4/4 green Elemental creature token named Ashaya, the Awoken World onto the battlefield. [-7]: Untap up to six target lands. They become 6/6 Elemental creatures. They're still lands.