This iteration of Sol Ring comes from The Lord of the Rings: Tales of Middle-earth, and seems to feature the light of the long-gone Laurelin, the Gold Tree that lit the world back in Valinor before Ungoliant and Sauron destroyed them
Living Death Living Death (no, not Living End) is a 5-mana sorcery that basically swaps the creatures in play with the creatures in graveyards
At the beginning of your end step, you may return target creature card with power less than Mirko's from your graveyard to the battlefield with a finality counter on it
Wizards of the Coast has promised not to include this in any of its sets
Omnath, Locus of Rage Once the #1 contender on this list, 7-mana commanders need to have an outsized effect on a game to claim the command zone for themselves
Even better, Karazikar taps that creature down for the turn so it can't just callously block and avoid attacking