Roil Elemental [Zendikar] 149 Set: Sword & Shield: Base

Set: Sword & Shield: Base Set Type: Metal Rarity: Common Retreat cost: Colorless

Set: Sword & Shield: Champion's Path Type: Supporter Rarity: Secret Rare

glowing swarms of fireflies may be released only from the highest towering platforms in the city during the upcoming summer solstice

Set: Neo Destiny Unlimited Type: Fighting Rarity: Holo Rare Retreat cost: Colorless

And there were signs along the way to pay attention to

Roil Elemental [Zendikar] 149 Set: Sword & Shield: BaseSet: Zendikar Type: Creature Elemental Rarity: Rare Cost: {3}{U}{U}{U} Flying Landfall Whenever a land enters the battlefield under your control, you may gain control of target creature for as long as you control Roil Elemental. A vortex that devours everythingeven the souls of the living.