User blog comment:Mich, Michele & Kuhla/Future Units Preview/@comment-49.149.151.39-20150719034359/@comment-49.149.151.39-20150719035637

Well your right and at the same time wrong.

Japan already implemented this: The rare summon gate now onyl cost 3 gems per summon. They have a summon called ultra rare summon and it is a guaranteed rainbow door and may contain and old unit that can evolve to 7 star. There is also the godly rare summon that is guaranteed rainbow door and you can obtain units ONLY from feeva's batch onward. So yeah gotta start stacking up gems couse it is said to be released in global after they release Vesti' batch that may be released late august or early september