Seriously, don't be that new player.
I just had an Irelia that literally first timed her in ranked. Fucking, FIRST TIMED. By first timed I absolutely mean her first time in her whole account that she's played her. The result? 4/10/1. Hypocritical too, because in the beginning of our game she said "Yasuo i had an 0/4 and an 0/5 last game, can you do better?" It would've been fine if she was just using a champ that she was experienced with and still got 4/10/1, everyone has bad games, but honestly, don't be that one fucking dude who decides to first time a champ in ranked after it gets reworked/released and getting your team to pay the costs. I would love, so much, to ban Irelia, but I'll just get reported for banning another person's champ so I don't. She was gold 5 too, and even a silver 1 can have more common sense than a fucking GOLD 5. Seriously, Riot, do something about this.
"For players whose primary way to engage in League is through ranked (and that’s a lot of players) a week can feel like a long time, especially since the champion will have been on the PBE before that.
However, we sympathize with the basic problem you’re hinting at, of someone going into ranked with a champion they have never played before, and having your team possibly pay the price. While we think the new Practice Mode will help some with this problem, we also have discussed requiring you to play with the champion – even if it’s as little as one game – before you take him or her into ranked. No concrete plans at the moment, but it’s something we’ll keep on our radar."
- Excerpt from Ask Riot
So, were you just lying about keeping it on your radar? Because you sure as hell need to do something about it.