A large golden disc, shaped and stylized like a sun, descending from the sky [The Immortal Sun]. The sun disc approached a large circular stone tablet covered with strange sigils [The Guildpact], and the two discs merged, becoming a single golden disc. Cracks appeared in the golden disc, small at first, then widening, growing. The disc crumbled away into nothingness.
The scenes shifted faster now, barely even an image forming before being replaced. A fizzling torch. A broken clock with a clean face. A mummified head facing backward atop a mummified body. A split tree, its sap oozing into the ground. A shattered shield, its shiny metallic pieces torn and scattered.
She closed her eyes against the onslaught, but still the images came tumbling through her head, crumpling her in mid-air. A falling dragon [Niv-Mizzet]. Giants, covered in metallic blue [Look at the art for Wanderer's Strike], stomping through streets [Ravnica]. A massive flash of light, consuming a world [Bolas' spell].
An angel descending from the sky.
Nissa opened her eyes, and the angel continued to descend. It was the angel from her nightmare. The angel that reminded her of Emrakul.