New Rotating Game mode Concept: Megachampions

The concept of the game is a 3v5 on summoners rift where the 5 play normal champions while the 3 they oppose play champions that are buffed up to be able to fight while down in numbers. Here are some of the ideas I had for these "Megachamps"(or, you know, just let people control the doom-bots)

Alpha Aatrox: Passive: Aatrox's auto attacks deal 1-8% of his target's current health, and reducing shields and healing on his target by 15% for 1 second

Q - damage and speed of his current q, but with the mobility of his old q

W - Hitbox of old skillshot, but the first enemy champion hit gets the chains from his current w

E- old 3 hit switch passive

R - his current ult with aoe magic damage and attack speed from old ult

Monster Yi: Passive: Current Double strike, yi has 50% tenacity, and no attack speed cap on this champion

Q - current alpha, prioritizes enemy champions, scales with 100% of his bonus AD and 100% of his AP, critical strike modifier changed to 200%

W - Has an additional heal scaling of 100% bonus AD and has irelias W effect where the channel continues through CC

E - Same as current

R - Same as current

Nasusan: Same as current Nasus, but his Q is a passive on all his auto attacks

Showstopper Draven: Q axe buff doesn't need to be caught and his w movespeed is a passive every time he auto attacks an enemy champion it refreshes

Harmony Kayn: At level 6 he chooses one form, at level 11 he gets the benefits of both forms

Rapid ascension Kayle: Starts game ranged, becomes permanently exhaulted at level 11

While these champions are no where near enough for such a game mode, it is still a fun idea to mess around with. What are some of your ideas on how you would break champions for this kind of environment?