A Dion, Bahamut's Dominant Commander deck is a Knight Typal deck, meaning it's a deck that focuses primarily on one creature type, in this case, Knights
(You may cast a spell for its web-slinging cost if you also return a tapped creature you control to its owner's hand.) Playing with Modal Double-Faced Cards To determine whether it is legal to play a modal double-faced card, consider only the characteristics of the face you're playing and ignore the other face's characteristics
Because of this, shadowless cards carry a premium
The Toph player got a huge boost when the Infinite Guideline Station player played Urborg, letting their land artifacts tap for Black mana
In a trading card game, you have to have a reason why people cant just put literally all of the best cards in one deck and call it a day
That said, the pieces are definitely already here for a good Group Hug deck, and I have a few ideas for how to boost it even further