Realmwalker is a great addition to any green-based tribal deck, whatever format you play, whether it be your Frog EDH deck helmed by Grolnok, the Omnivore or the most obvious place for it: Elves
Teferis Protection White is spoiled for choice when it comes to protection spells, and even some of the cheaper options like Eerie Interlude and Your Temple is Under Attack are more than playable
Engines like Rhystic Study and Mystic Remora keep your hand full, while counters like Force of Will and Swan Song keep opponents in check
Late Game Finisher Gol.D.Roger is a game finisher play, preventing your opponent from activating their blockers if you or they are down to 0 Life cards
Even if you're only looking at Commander, this allows you to put a Sol Ring directly into play, but that's probably the tamest thing you can do with this thing