So I came up with a little game that we could try, and it goes like this: choose any two champs and combine them by swapping/merging their abilities, ranges, passives, etc., although you can only swap abilities that match each other (swap q with q, r with r, and so on). Number and scaling changes are ok within reason. Try to make the most op/fun/weird champ you can think of with only two champs. For example, let's combine Kassadin and Zed...
Contempt for the Weak
Zed's basic attacks against targets below 50% health deal 6 / 8 / 10% of the target's maximum health as bonus magic damage.
This effect can only occur once every 10 seconds on the same target.
PASSIVE: KassaZed draws energy from spells cast in his vicinity, gaining a charge whenever a spell is cast near him (including his own spells). Upon reaching 6 charges, KassaZed gains the ability to cast Force Pulse.
ACTIVE: Kassadin can emit a pulse of void energy, dealing magic damage and slowing enemies in a 80º cone in front of him for 3 seconds.