Serialized Elven, Dwarven, and Human Sol Rings can only be found in some non-Special Edition The Lord of the Rings: Tales of Middle-earth Collector Boosters
Search for the Frozen Esper I could see getting blown out by Nature's Claim on White Auracite, but feeding your opponent 4 life is a decently big drawback
It can be rough exposing your land drop to anything that kills a 1/1 creature, but the trick is to use Dryad Arbors versatility to your advantage and find clever ways to get it into play, and ways to use the body once it's there
more often than not, Im playing a Grixis brew on Arena, whether its Standard, Brawl, or Pioneer
WotCs willingness to ban newer, powerful cards quickly suggests a reactive approach to balance