Is it intentional that this gives you multiple legendary tokens to kill each other?

I feel, in a set with TDFCs there is a cleaner solution: "may discard a card, if they don't transform ~."

On the back-face you have the Cat God and it drains life upon transforming back. Maybe the set thrives on the token sacrifice, but on a rare this will not be a Limited relevant card anyway, right?

For the Cat God, there is benefit to them dying. Since you can keep one copy of a legendary, I think it'll be fine. That is something I'll need to review for the other four God tokens however.

The dfcs are a single cycle that I was originally hesitant to include, but changed my mind after remembering the enchantment-to-land cycle in Ixalan (I forgot about the five dfc artifacts in the set though). I would rather scrap the dfc elder gods (none of the elder gods are akin in appearance to particular animals or to humanoid species in appearance and would allow a more open artistic depiction based on the idea) entirely than add more dfcs to the set.