The deck concept is great. I really think it would be fun, I haven't ever seen a non-planeswalker deck with this many planeswalker. Very Cool.

I really like how all of the changelings of this deck works, but i have one suggestion Oath of Gideon looks like it would work really well in this deck. The extra loyalty counter on each planeswalker for only 3 mana would cut down on a lot of time to get bigger, badder combos out.

First of all thank you both very much for your feedback! :)

As to Oath of Gideon it was included in my deck once, but i had to cut it for ramp. Now i think i should take out Savor the Moment. It is better in direct useage, but as you said it should outperform in the longrun...

Coat of Arms, Urza's Incubator, and Obelisk of Urd are cards I usually suggest for tribal based decks, but honestly they wouldn't be to bad in here either. Doubling Season with planeswalkers does in fact allow them to enter with double their original loyalty counters, making most an instantaneous ultimate. Mycosynth Lattice is good to give you the availability to cast anything you can match the cmc of, which doesn't appear super difficult. I do recommend running at least one of each, or even just one or two basic lands in decks like this, as Blood Moon, Path to Exile, and Wave of Vitriol style effects will plane and simple hose you. Ugin, the Spirit Dragon and Karn Liberated are just fun cards to run, and great in superfriends. Tutor effects, such as Demonic Tutor, Diabolic Tutor, and Call the Gatewatch are not bad to run, as they allow you to grab the cards you need if and when you need them. Nevinyrral's Disk is a boardwipe that doesn't hit your planeswalkers, but empties the rest of the field. Oath of Nissa is good for the same thing as Mycosynth Lattice, but it only applies to your planeswalkers. Sliver Hivelord is a cheaper Avacyn, Angel of Hope for your creatures, and is a bit unexpected. I really do love this deck, I'm glad to see some superfriends players in edh!!!

so many tap lands, consider Amulet of Vigor

Now that I think about it, Omnath, Locus of Rage and Harabaz Druid would be excellent in this, for the various procs, also I was wondering whether or not shapeshifters also become artifacts, due to that ability, and if so, Steel Overseer and Unwinding Clock Would be fantastic.

Thank you for your Feedback! Omnath, Locus of Rage sounds awesome. He has high CMC but i think that shouldn't be a Problem. As to the rest.. as soon as i have 5-7 mana for Reaper King i don't really need more, and i also wouldn't know where to get space for Harabaz Druid. And artifact is no creature type (sad).

Omg i have all those cards and im surprised, because i never thought of doing this. This looks s fucking fun, I am really looking forward to testing this deck. Thank you very much :D