Galio has higher ratios on his normal abilities than Burst Mages' full kits
has 3.1 AP ratio on just his normal abilities + passive. For comparison, Veigar has 2.35 - 3.1 (depending on missing HP) and Syndra has 2.55 - 3.55 (depending on CDR/number of balls she has out) including their ults. I think Galio has the absolute highest AP ratios in the game once you factor his ult in and its ALL aoe. Thats not even factoring in the obscene % hp damage. Thats just his straight up ratios.
Kinda overkill even before the spammable 50% hp aoe, semi global ult, tons of CC, and a shit ton of damage reduction don't you think?