Champion idea

"NOW BEFORE YOU START, if you think this champion is too op, read all the way to the end" A champ that had these abilities, or something like it now i got this idea from jinx's q, Caitlin's R and lastly, Heimerdinger's R Ok so his basic attacks are like a normal mage Passive- Edit Killing a unit with an ability will refund 1-5% of the mana cost (only works once with each spell) All basic abilities have cooldowns- 12/11/10/9/8, but when used, the ability becomes this (also if you use another ability it becomes spell breaker and while spell breaker is on, the normal ability is on cooldown like normal Spell Breaker- 0 mana cost 0 cd- returns your normal basic attacks

Q. 40/50/60/70/80 mana- 25/35/45/55/65 mana per attack- first attack does splash damage and others deal damage overtime W. same mana cost- first attack stuns for .1/.2/.3/.4/.5 and then other attacks slow for 1/2/3/4/5% E. same mana cost- first attack knocks back enemy a small distance and then other attacks can be used while running/not stopping to attack (like a Lucian ult except basic attacks) E Notes- i have no idea what this should be, i want it to be air based or something like that, but this is the best i got, so please come up with something. R. 75 mana per sec cost- Channel in place for 4/3.5/3 sec (you can stop the channel and return half mana and cooldown) and afterwards, next ability you use will cost no mana will be more powerful. When you are charged, all abilities go down to 0 cd, including your ult, but once an ability is used, R is put on cooldown. (also your R then becomes an ability that is to mimic your Auto Attack) (120,100,80 sec cd) When channeling your ult can be canceled if damage by an enemy champion or turret. if this happens your ult goes on 75% cooldown Q+R- deals more damage and spawns a lava pit, dealing damage over time and slowly disappears from the outside-in W+R deals splash damage and stuns 2-1 seconds (scaling from point of origin) and then outside of the stun area will slow 40-10% (scaling from stun edge to last edge) E+R deals splash damage and knocks up and back from point of origin R+R deals damage in a straight line (does less damage the further it goes) R+R ALTERNATE deals high amounts of damage to target enemy Now i know what your thinking "THIS CHAMPION WOULD BE TOO OP. now let me give you the catch of this champion. Now first, all Ultimate abilities besides R+R Alternate will be skillshots and i know you still feel the same, then lets add the fact that all autoattacks and first attacks Powered by Q,W,R_can be interrupted by any enemy (so minions, monsters, and enemy champions will block the shots and be dealt the effects.) (but what im saying is, is that these auto attacks and abilities are still point and click, just they can be interrupted.

Now this is what im asking of you, first I'm asking Is this a good, decent, or horrible idea? (put 10-1 in comments) _and now my second question is _Do have any ideas to make this more balanced (not op or super sucky, cause i want this to be a champion to be fair and balanced)?

Now just normal questions

1. should i make a cap on how many auto attacks each ability it can do before it just returns to normal autoattack?
2. what do you think would be better to change?
3. would you play this champ?
4. do you think this would be a high level skill champ, medium, or low?
5. which ultimate is better? R+R or R+R alternate?
6. what names would each ability be?