Appeal to Science
Ask him for Avogadro's number written out in full.
Any true Heimerdinger player will be unable to resist the call of science, and will type out 602214085774747400000000, and while he does this, you can easily land your spells.
If it doesn't work, then you aren't playing against Heimerdinger.
That is a cleverly disguised Azir.
Stop talking to the pidgeon.
Do not do this if you are playing 
or 
as you will type it yourself due to your superior knowledge of science
Or just do this. http://i.imgur.com/By3o2.png?noredirect
You could always take smite, the items they build into arnt bad all around, and the upgraded snores can help a lot
Or just pick Syndra and throw his science in his face... oh wait Syndra sucks RN nvm
Just go to https://www.reddit.com/r/askscience/?
As an Az- I mean Heimer main, I approve.
talking might be a tad bit of a problem (its kind of a deaf joke): http://www.nchearingloss.org/pse.htm
