Anti-Bot Measures: Captcha Code to enter games (Dominion specifically)

Bots are a continuing problem, mostly in Dominion, and i believe the easiest way to deal with them is to simply be smarter than them.

Many sites use systems like Captcha to prevent bots from flooding their servers and annoying the hair off of everyone (including league!). I was thinking that if we could find a way to employ Captcha or a similar system into the League client, we could block bots from entering games.

I suggest we start this experiment on Dominion only, and if the community is happy with it we can employ it into other gamemodes as necessary.