Mimic

Passive - Reflective Mirror: Mimic deals 1/3/5/7% of damage dealt back at the attacker. This can only happen every 5/4/3/2 seconds and does not work against multi-target spells or damage over time. This is increased at levels 6/11/16.

Q - Copycat: Shows the last spell cast nearby and when activated stores the spell. After five seconds you can recast to use stored spell, stored spell lasts until used or after 120 seconds. Stored spell's rank is equal to copycat's rank and instead of normal modifiers it uses 25% of Mimics ap as the modifier Cooldown: 10/9/8/7/6 seconds Cost: 10/15/20/25/30

W - Swap: Target champion has their cooldowns reduced or increased by 3/3.5/4/4.5/5 seconds. If ally their cooldowns is reduced and the cooldown of this spells is increased by the affected amount. If enemy their cooldown is increased or put onto cooldown by said amount and this spells cooldown is reduced by said amount. Mimic cannot target himself and this does not affect ultimates, this spell does work with udyr's R however. Cooldown: 10 seconds Cost: 10/20/30/40/50 mana

E - I'm Over Here: Chooses target ally champion or minion and swaps places with them. if it's a champion they must respond for it to work by clicking on an orb over there head. Afterwords both Mimic gains 10/20/30/40/50% bonus move speed for 0.5/1/1.5/2/2.5 seconds, if Mimic swaps places with a champ they also receive this bonus. Cooldown: 14/13/12/11/10 seconds Cost: 30/25/20/15/10 mana

R - Disguise: Mimic teleports to target ally champion and upon arrival they both stealth for 1 second. After stealth Mimic appears as the target champion with their current health and mana to enemy champions and both benefit from Mimics passive. This last 3/5/7 seconds and when it ends both mimic and target champion stealth's once more for 0.5 seconds. Cooldown: 90/60/30 Cost: 150/100/50

Of course stats need to be adjust but here it is

I've thought of a champion like this before, except it would start with all its abilities named copy, and like the current ability set it would store the next spell cast, however it would have toggles for enemy and ally spells so you didn't accidentally copy a spell from your support or adc and find you cant use it. also I think this champions passive would be a basic attack passive with an activate button, allowing them to switch their basic attack style after a set amount of time. something long like 10 minutes should work so that even in the shortest of games they would be able to swap between melee and ranged at least once.

why so many down vote this guy sound awesome