How about Kayn on TFT ?

Today I am writing this post for you guys because I have a little idea for bringing Kayn to TFT, more details:

Kayn: 4 money *Assassin

*Devil

*Shapeshifter

While fighting Kayn will still have a role like Evelynn is to jump behind enemy team, burn mana and deal critical damage. Start 0 mana, full 75 mana will transform and the dignity game begins: Skill: "Umbral Trespass"

• When your team has not activated the origin or class that Kayn has, after "Umbral Trespass" into the champion was damaging by Kayn, Kayn has a 50% chance of shaping to the Rhaast or Shadow Assassin. When there are 3 Demons or 3 Assassins on the table (including Kayn), Kayn has a 70% chance of becoming member of Demon or Assassin. When there are 6 Devils or 6 Assassins (including Kayn) on the table, Kayn certainly has a 100% chance of becoming member of Demon or Assassin . If there are 3 Assassins or 3 Demons on the table the chance will again 50%, as same as for 6 Assassins or 6 Demons will be 50% for both sides.
• When shaping in the Rhaast form: Kayn greatly increases his base health and losing the ability to deal critical damage, be able to use "Reaping Slash", each target that is hit by "Reaping Slash" will be burn mana. "Reaping Slash" needs 60 mana to use.
• When shaping in the Shadow Assassin form: Kayn still gains health when shaping but not as much as the Devil, losing the ability to burn mana and slightly increasing the base attack speed, be able to use "Blade's Reach", create a long straight line to deal critical damage. "Blade's Reach" has a mana to use is 100.

I hope you guys can read this post and give me your feedback in the shortest time. Thank you very much for reading. Regards.