...Just because someone got Ezreal and denied your trade.
Maybe I'm just extremely unlucky, but almost every time me or someone on my team got Ezreal, we denied one trade and the person dodged. So far, I've only gotten to play about 2 games where someone on my team got Ezreal, and that's out of 10-15 games.
If you really want to play new Ezreal, go play bots or SR instead of getting upset someone else got Ezreal in an ARAM and didn't give him to you. You're making 9 other people wait, again, just because you didn't get rng lucky.