Hotfix Galio (please read)
Full AP Galio is ridiculous. He can 100-0 an adc with a single Q, which is spammable. No one should be able to have a HUGE area of effect ability that is not even an ultimate being able to 100-0 an adc. Not to mention he can have some tankiness. Hotfix??
I would show footage, but apparently the replay has expired? I guess even the replay function couldn't handle Galio's ridiculousness.

At this full build, his passive (a single basic) deals 564 magic damage.
His Q deals 793 magic damage + 483 + 62% of target's max health in magic damage over time???? It's also on a 4.5 second cooldown, costs 90 mana and has a huge area of effect.
He can have up to 613 health shield too with this build. He gains 40+(0)+(35)% damage reduction on his W active (which is 75% by the way!!) from magic damage and half that for physical damage.
His E deals 843 magic damage. Which is ALSO AoE with some radius, AND it knocks them into the air.
His ultimate, well... it deals 835 magic damage, and grants 30% damage reduction to target ally before he lands.
That means, in a single combo, he can deal 835 + 843 + 564 + 793 + 483 + 62% of target's max health, if he lands all of it. That's 3518 base damage, and then 62% of target's max health ON TOP OF IT ALL?
Who thought this was a good idea, like seriously? He deals more damage than freaking Veigar, and is tankier than a Jax with ultimate that builds tank items.