"Gun God MF" must not be made an Ultimate skin
It doesn't meet the standards of an ultimate skin. This sets a bad precedent for future ultimate skins as being legendary skins with a cash grab mark up by including an in-game chroma selector.
Reasons 1: There is nothing unique or new about it. Sona changes music. Ezreal changes as you level up. Udyr changes based on the level of his abilities. 2. The model changes in game have no purpose and make no sense in either the context of the skin or the character. Sona changes based on the theme of the music. Udyr based on his form (something he already did). Ezreal thematically gaining armor as he advances like megaman. There is no rhyme or reason for why MF changes chromas mid-game at the fountain. I don't think most players will even care about that ability, because if they prefer one chroma or another they will just stick with it at the beginning and have no real reason to change mid-game based on game circumstances. It is just tacked on to justify beefing up a legendary quality skin to ultimate price level. 3. The model changes are not different enough to qualify as ultimate level. The only thing that changes are the guns. The rest is a chroma texture change. 4. The animation and effects quality is arguably not up to ultimate standards either.
Before release, you should put MF's skin at the appropriate legendary level. Then offer the chromas at a higher price than normal chromas because of the gun model changes. Offer a pack of them at release with icons and for those who buy the whole thing you'll make as much money, you just will be respecting the players more and being more honest about what kind of skin this really is. it will leave room for a proper ultimate later, and prevent the mark of "ultimate" from becoming meaningless for future skins.