It's an artifact that can store aether (mana), temporarily locks away a foe, and must be destroyed before time runs out
1 Non-foil token or art cardcan be any of the following: Ad/token card (65%) 20 Art cards (30%) 20 Signature art cards (5%) Collector Booster Contents 3 Traditional foil uncommons 1 Traditional foil showcase memory corridor uncommon 1 Foil-etched uncommon 1 Traditional foil basic land, rare, or mythic rare scene cardcan be any of the following: 10 Traditional foil full-art basic lands (86.4%) A borderless scene card appears 13.6% of the time
However, most of the rest range from decent to outstanding
Once the ability has been activated, the greatest power among creatures you control no longer matters for this ability
So you can use Elfs, that just enter the battlefield
This makes Sol Ring a popular grab in Commander because its in most decks in the format