Sythis, Harvest's Hand costs less mana, gains additional life, and is an enchantment itself
Not a cheap combo to pull off by any stretch, but very classic Urza shenanigans
They dont have a coherent set of mechanics or abilities associated with them, but they do tend to be either hard to remove in some way or somehow disruptive or both
That being said, Regal Force does have the benefit of drawing off of itself at absolute minimum
A modal double-faced card can be transformed or be put onto the battlefield transformed
I know a lot of people wanted Dream Devourer as a commander, and well there he is as Edgin, u/Yojimbra commented on Reddit