TFT Chess Piece Ideas!

I don't know if RIOT team can see it or anyone else mentioned it already, but I had an idea for upcoming chess pieces type. It called Immortal: it might be similar to Imperials stacking effects. So when you have (2) Immortals: 1 of the Immortals will become immunity and unable to gain any outside damage for 5 seconds (the same as Tryndamere ultimate in League) (4) Immortals: everone in Immortal pieces will gain the same undead effects. So to begin for the champion that can be used to perform the "Immortal" pieces. There will be:

1. Sion (1gold) (Immortal/Knight), using "Soul Furnance" when he's at full mana, maybe he can use his passive along of "Soul Furnance" when he got full mana.
2. Zilean (2gold) (Robot/Immortal), using "Time Bomb", and the bomb got like 5s delay to detonate, during that time, Zilean can gain mana (probably 50mana or 75mana) to throw the 2nd Time Bomb to activate the stun area.
3. Ekko (3gold) (Hextech/Sorcerer), basically still not thinking a suitable ability for Ekko to use yet, maybe he will got the 'Parallel Convergence" for area stunning and probably still got a passive of 3 stacks like "Z-Drive Resonance"
4. Tryndamere(4gold) (Imperial/Immortal or Immortal/Blademaster), "Spinning Splash" could be appropriate, when he spin to some amount of enemy, he can gain more Critical Percentage or something like that. That's all for my ideas I guess, if you enjoy give me a vote :)