Check out Urban Madness. We are a fun guild with a lot of guild events, giveaways, and threads to improve everyone's game. Whether it's ELO, a coliseum event, or just a standard question on a deck that you may have, we have A LOT of members that are willing to help both on our boards and in our chat room.
We do have a strict requirement of level 30, but if you are interested in joining us when you reach that plateau then you are certainly welcome in Urban Madness
Until you hit level 30, you can always hang out at Casual Grind. We aren't too big a guild and the activity has been lower as our fearless leader/founder is going through some tough shit irl and hasn't been able to play recently.
We do have all the extra battle points up and no requirements, though, so if you want a level boost before you can go and hang with the cool people or whatever, we'll be happy to have you.