Change something about a champ to make them super broken. Garen: At level 16, basic attack will no longer stop his passive regen. Yorick: His ghouls now apply on-hit effects. Evelynn: Her passive no longer has a range indicator meaning she can't be seen unless in combat or by true sight.
you can perfectly steer sion's new ultimate
Gangplanks Ult no longer drops canon balls in a limited area, it drops the entire ship on you dealing at minimal 50% of your max health, up to 90% depending how far away from himself he uses it.
Poros now follow 
around, randomly dragging enemy champions into the bushes and killing them.
Nami supports with eFISHenSEA.
Leave Riven where she is. >_>
zed shadows can be switched as many times as you want until the shadows disappear
's Rappel is now global, so this means she can jump on ANY camp of the ENTIRE map.
Syndra can now throw Champions
Tristana's Rocket Jump now resets on champion kill.
Nocturne's ultimate now resets on a kill or assist.
TF ult is a true global.
Kayle's E has double its current AP ratio.
Miss Fortune: At level 11, minion and non-epic monsters no longer disable her passive...
If only.
Teemo: At Level 16, Teemo's Blind Dart, Noxious Traps, laughs, taunts, jokes, and dance all apply a taunt to enemy champions within 5500 range of Teemo until they are within 600 range of Teemo (min. 1 second). (This taunt does not apply while Teemo is within 1000 range of a turret or allied champion.)
Edit: I should add one more thing in parentheses.
Veigar's Q farm grants half of the bonus he would receive against champions.
Ex: Killing a minion grants 2.5 AP with Q maxed, and 5 when killing a champion. An extra 1 bonus if Q is used for final blow against minions and champions.
All Skills have their range increased based on how many Feast Stacks Cho'Gath has and at what level Feast is at.
(Global Silence FTW)
Blitzcrank hooks now ignore minions, and are targeted with global range. Tryndamere's ultimate has replaced his passive, meaning that Tryndamere doesn't die. ever. Yasuo has double crit chance. oh wait....
Nidalee Spears go back to pre-rework but she still has the rework kit :3
Sion may now reactivate his ult to use "Brakes" stopping him from moving.
e has no cd. And costs no mana
at base for tea and pentakills)Master yi kills reset all his abilities
Talon's ult deals damage for each blade that passes through an enemy, rewarding good positioning. Also his Cut throat silencing his target. That would be nice ;)
Morde's max shield now increases based on total AP in addition to its live values.
lol you basically just reverted eve back to old eve.
Wicks w gives him and everyone around him a 100 percent of his attack speed
ult now refreshes completely on all kills and assists, not just when it deals the killing blow.
Aatrox's passive activates every time he dies and restores 100% of his health regardless of how much blood is in the well. In other words, Aatrox will never actually die.
Morgana shield prevents all CC while the shield is active and doesnt disappear until after the entire 5 seconds. OH WAIT
