Seeing how quickly Solphim gets out of control, expect your opponents to paint an immediate crosshair on her head
Delver was in Canadian Threshold decks, Team America decks, UR Delver decks, BUG Aggro decks, and on, and on

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Realmwalker Realmwalker is a reason to run green in typal decks, as you get support for the creature type you want, and playing creature spells from the top of your library is a very strong source of card advantage
Sometimes, these are commanders who offer benefits to their opponents and can fall into the group hug category
Finally, in Big Mana or control strategies, it acts as a resilient mana source in the early game and becomes a powerful, inevitable win condition that you can sink your excess mana into