It only happens once a turn but can give you double the activations on your abilities, which is pretty darn good given the number of Elves that produce mana
Many decks look to discard cards to enable their strategies, and so they often include cards that synergize well with this
Best Selesnya Mana Ramp Cards (Faeburrow Elder, Karametra, God of Harvests, Miraris Wake, Selvala, Explorer Returned) Weirdly, when you put the two best mana ramp colors together, you struggle to find many playable options
Its possible from a design perspective that changelings do need a certain amount of space within a set, but I dont see that to be true
Sidequest: Play Blitzball benefits going wide and tokens, while the blue and black sidequests probably fit in a midrangecontrol shell
The option of exile-based removal or a double Raise Dead that can get planeswalkers is incredible