I guess I don't know if there is an official tournament for this style lol, but the EDH site (http://mtgcommander.net/rules.php) talks about optional sideboards and league play. I haven't ever been to an official tournament and mainly just play with my close friends. Thank you again for your constructive criticism.
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Thank you for the comments. I realize the deck can only have 100 cards, and I wouldn't take the sideboard to a tournament. I just wanted to have my other "dragon" possibilities there so I could compare easily. I also like your idea of using Bear Umbra, and I may try to fit that in.
Sometimes the celestial purge is not the best but what would you use in place of it? as for the circles they help but i think i may change them to prevent damage / prevent combat damage cards.