Example kit for an AP Support Mage that deals physical damage
Passive: 3rd basic attack deals base +50% AP physical damage over 3 seconds, does not stack.
Q: Single target skillshot that deals base +30% AP physical damage and applies a debuff that can only be triggered by other allied champion damage which deals base +60% AP physical damage. 10/9.5/9/8.5/8 second cooldown
W: Passive, marks enemy champions who have dealt 30% of a nearby allied champions health within 2.5 seconds, causing your next basic attack against them to double in range(1000-1100ish total) and stun them for 1.5 seconds. 12 second on-target static cooldown
Active: Targets a nearby ally to give them the option to trade places with you. If ally accepts you gain a shield or AR/MR or something. 28/26/24/22/20 second cooldown
E: Leap into the air becoming untargetable for 0.75 seconds dealing base +60%AP{ area of effect damage in a targeted arc(very similar to 
Miasma) 18/17/16/15/14 second cooldown
R: Targets an area that buffs all allied champions inside temporarily granting them your passive for 8 seconds. Also does not stack from multiple sources. 120/100/80 second cooldown.
I did my best to make it viable as a support and not solo carry, I feel Ive accomplished that goal.
Like I said its just an example kit, maybe some of it works maybe not :P
