Scry 2 (Look at the top two cards of your library, then put any number of them on the bottom of your library and the rest on top in any order.).
0
Look at the top card of your library. If it's a land card or a creature card with mana value less than or equal to the number of loyalty counters on Nissa, Steward of Elements, you may put that card onto the battlefield.
-6
Untap up to two target lands you control. They become 5/5 Elemental creatures with flying (This creature can't be blocked except by creatures with flying or reach.) and haste (This creature can attack, and as soon as it comes under your control.) until end of turn. They're still lands.