Make a balance change based on logic
Example.
Lee sin is now immune to Nocturne ult because he's blind and already sees darkness
Have fun~
Example.
Lee sin is now immune to Nocturne ult because he's blind and already sees darkness
Have fun~
wins every game
cannot buy items that look like weapons.
Zac is immune to all bludgeoning and piercing as it does not split him into more parts.
If Teemo uses his Q on Vel’Koz, the screen will turn completely black instead of making auto attacks miss.
Cannot be silenced because she's already mute.
Nami gets the Cass treatment and can't buy / doesn't need boots.
Immune to ignite.
All towers and assets on his land are his.
(and all other flying champions) Cannot be hit with melee or low ranged attacks.
Champions who canonicaly hate each other cannot be on a team anymore.
being the biggest offender.....
attacks slightly annoy the enemy instead of dealing any damage

Automatically receive water walking as part of their passives.
Non-flying and non-hovering champions are automatically slowed when in the river and remain slowed until exiting the river.
Except for when Trundle, Nunu and Willump, and/or Lissandra are in the river at which point they may toggle the river to freeze over. While the river is frozen, champions do not benefit from water walking.
Additionally, Brand takes damage over time while in the river unless it is frozen.
can toggle brushes to burn them to ash, leaving behind scorched earth so that nothing may grow there again. Ivern cannot plant brushes on scorched earth and Brand may use this new ability on Ivern's brushes. Additionally, enemy champions inside brushes when burned by Brand are immediately ignited.
and
ults are switched
deals bonus damage to 
If
lands a Q on Mafia
, he goes back to his default skin.
Yordle's can walk through (underneath) 
ignores all physical damage from most champions, and/or has a 10,000x larger health pool.
"what is death may never die" yada yada yada.
E-now causes your computer to go to sleep.
brand no longer takes damage from ignite and nami's w doesnt heal but damages him XD
is now immune to all bleeding effects.