First off, as you're using the legacy banlist, the landbase could be improved. Take out the Sunpetal Groves and a couple of basics, add in Savannahs and fetchlands.
Next, some of the cards don't seem very strong; for example, Forked-Branch Garami is a 5-mana 4/4 that only does something if it dies (and even then it can't return many of your creatures). I want to replace quite a bit of the deck; are there any cards you have to keep (e.g. cards that were centrepieces of the original deck)?
Finally, how fast are you expecting your friends' decks to be? This deck is pretty slow, going up to 6 mana (or even 7 if you include the Archon's bestow cost). Since you have access to any card, you should be able to make the deck quite a bit faster.