ok before I even get into the abilities, I have another joke suggestion
"In soviet Runeterra, Vindictum summons YOU!"
Generally, the only characters who have energy would be those with more of an Oriental styled backround. If this champion were say, modeled after a samurai or a japanese Shugenja, energy might not be too much of a stretch, since he seems to be more of a general caster though with an oriental asthetic, I'm not sure I totally support him having energy over mana. It's your call in the end, but I'm on the fence about it.
Also his only real summon is his ultimate, it does makes his moniker of the "Vengeful Summoner" a little misleading. If he's a summoner he should probably have a summon that's his Q, W, or E and his other two abilities should probably have some minor influence on the summoned creature. At this point Malzahar is almost more of a summoner because his pets would be more active than the summon of your champion idea. Just my two cents, moving along....
Passive 1 - 25% CDR for each enemy champion would be too high considering CDR caps at 40%. If it was dropped to say 4% at level 1, and progressed at level 7 to 6%, then again at level 13 for 8%. It would hit 40% if he was around 5 enemy champions, meaning you might want to get 1 item providing CDR to solidly hit the cap around 3 enemy champions.
Passive 2 - Same basic premise, if that's the energy regeneration per second, consider lowering it to a flat 10 energy per 5 seconds per enemy champion within X range. with 5 enemies nearby he regenerates 50 more energy every 5 seconds, and on a 200 energy bar, that'll be more than enough.
Q- At the rate of AD and AP your neutralizing you might as well just make it a silence effect with a significant attack speed debuff. I would regulate the damage at lower ranks, probably to 70/105/140/175/210 (+.5 AP) and at most make it an AP and AD % debuff at about 5/7/9/11/13 (+.01% AP). I'd also consider making the CD slightly higher, more in the 9 second area considering it does a secondary effect.
w- Don't worry about the armor and magic resistance cap on this one, people are either stacking armor and mr, or they aren't. I'd honestly increase the amounts and just not have them scale, or have them scale at .1. 5 armor and 3 magic resistance at level 1 isn't doing anything honestly, so raise the amounts at lower levels and have it scale a little slower into the higher levels, more like 10/20/30/40/50 armor lost and 8/16/24/32/40 magic resistance lost with an AP scale of (+.05). With the average AP build for endgame hitting 400-600 your going to increase your base numbers by about 20-25, and still have them high enough to make an impact in the early game when your champions AP is relatively low. Then make it a 4 second debuff and increase the base CD to about 12 seconds.
E- Not so sure about this one doing movement and attack speed since the higher one does AD and AP. A lot of people are under the impression that Champions NEED CC effects, and the most common one is a slow. This champion already debuffs AD, AP, AR, and MR. Now here's a slow that can get up to 50% for movement AND attack speed. General rule, if your set on it doing both, make the 50%the attack speed and have the movement slow be half the AS slow. Make the AS debuff 20/25/30/35/40%, and the movement speed debuff 10/12.5/15/17.5/20%. And again, since it has a secondary effect AND does damage AND affects movement speed, this one is probably best in the 12 second area as well for a CD.
R - This one would probably be good enough if it worked a little more simply. Cast once, pick target, spell hits and deals damage. If this spell hits a champion then Vinny gets a summoned clone of the Champion that essentially functions like Mordekaiser's ult if he kills the Champion. The clone has all the stats and items, ect. Like Shaco's clone but takes regular damage. If you make it for about 20 seconds you can definitely use the Ult as an initiator on a team fight to start beating on squishier targets, especially if you hit the enemies AD carry. It doesn't have all the flair yours does, but the function remains, the damage remains, and if nothing else a champion is getting hit for massive damage only to get the snot beat out of him by himself. At about 20 seconds of duration I'd put the base CD at about 120 seconds.
So there's my review, I hope it provides some insight and doesn't detract from what you have envisioned, hopefully it's provided a little inspiration. Thanks for checking out Efarius, if you'd like to see more I have Timmoth, a ranged Hybrid Pusher and Quintus a tanky melee battle commander.
Timmoth, Psion of Power - http://na.leagueoflegends.com/board/....php?t=2177652
Quintus, The Battle Captain - http://na.leagueoflegends.com/board/....php?t=2193972