Us Magic: The Gathering players are an immature lot
A couple of months after adding Venat to the set, the team was struggling to come up with a successful design for the spaceship Ragnarok from FINAL FANTASY VIII, and we were considering trying out a different concept
Solitude can take care of many threats that are just too big for Prismatic Ending, most notably Murktide Regent but also things like Emrakul, the Aeons Torn, and so the two work very well together
If a multi-element card has either of the relevant elements then it can be added to the players hand as a card of that element
4 Beast Relentless Beast, Relentless, can become a character that loops almost endlessly, with the right pairing
Plus, every time they go back to this well (Like in Avatar) itll just make this card better and better