Im especially interested in using Herigast, Erupting Nullkite to pay the emerge cost of, say, Void Winnower or Ulamog, the Ceaseless Hunger
In addition to this, a big part of the reason these cards were so popular was because the mana in that Standard format was quite bad, to the extent that you were pretty close to wanting Attune with Aether in your decks even before the energy bonus, but once you have the energy bonus you might as well play Harnessed Lightning, which means you may as well play Rogue Refiner to power up your kill spell, and so on
The flexibility you get from this modality and instant speed is quite frankly groundbreaking, and I will certainly be jamming this card into my black decks going forward
Sorcery - Arcane Color tag templates(None) Llanowar Elves Creature - Elf Druid Color tag templates(None) Llanowar Tribe Creature - Elf Druid Color tag templates(None) Nature's Lore Search your library for a Forest card, put that card onto the battlefield, then shuffle