6 Umbris, Fear Manifest Formerly the most popular option for Horror-Tribal Commander decks, Umbris, Fear Manifest is a 1/1 Nightmare Horror for five mana that gets +1/+1 for each card its owner's opponents own in exile
However, that five-mana difference materializes through two very real drawbacks: the cumulative upkeep cost of one generic mana, and the ability of your opponents to player it around it
As someone who began playing the game when the retro frame was the sole option, I can confirm that it is still the best-looking card frame in Magic history (and I will brook no argument on the matter)
My theory on Sol Ring (and ramp in general, for that matter) is either we want it all the time or we should work around it, because if it means 10% of our deck is dead after our opening hand, it's probably not worth it
Creature - Knight Angel Karmic Guide Flying, protection from black Echo (At the beginning of your upkeep, if this came under your control since the beginning of your last upkeep, sacrifice it unless you pay its echo cost.) When this creature enters, return target creature card from your graveyard to the battlefield