This rainbow card was a highlight of the Sun & Moon deck and is no longer eligible to be used in a tournament
They might sell out so fast that if you plan on trying to get both, I'd decide which one you want most and make sure you at least get that as there's a chance by the time you're done with one, the other card will have sold out
Heroic Intervention Accumulate Wisdom Return of the Wildspeaker Benevolent River Spirit Rites of Flourishing Boomerang Basics Taunting Challenge Crashing Wave Captain Sisay Ember Island Production Eladamri's Call First-Time Flyer Fevered Visions Flexible Waterbender Join the Dance Forecasting Fortune Teller Koma, Cosmos Serpent Geyser Leaper Rhys the Redeemed Giant Koi Cityscape Leveler Gran-Gran Meteorite Honest Work Sundial of the Infinite Iguana Parrot Dark Depths Invasion Submersible Fabled Passage It'll Quench Ya
Read more about all the announcements from Daily MTG.
A limited number of both double rainbow foil and non-foil versions can be found, though double rainbow foil versions will be serialized with different total counts: 300 Serialized double rainbow foil Sol Ring (Elven) 700 Serialized double rainbow foil Sol Ring (Dwarven) 900 Serialized double rainbow foil Sol Ring (Human) 3,000 Non-foil Sol Ring (Elven) 7,000 Non-foil Sol Ring (Dwarven) 9,000 Non-foil Sol Ring (Human) The One Ring one-of-one promotional card will only be found in an English-language Collector Booster, while the Rings of Powerthemed Sol Rings can be found in all languages of Collector Boosters
