Fire Dragon's numbers will be way too high
Don't get me wrong, I love the new elemental dragon ideas. But the benefit provided by the fire dragon is way overtuned and will annoyingly make games way shorter, contrast to what the majority wants.
For clarity - here are the numbers. This isn't a joke.
Increases damage versus champions for 8/16/24% (based on stacks) increased Ability Power and Attack Damage, +50% if they have Mark of the Elder Dragon.