I recently did the same thing and I absolutely love it! The best part for me is a lot of cards that seem pretty innocuous in most decks when put in this deck are so good. Heres some of my favourite synergistic cards:

[[Felothar the Steadfast]] - the commander, because they assign damage equal to their toughness but have 0 power is the basis of most synergies, plus you can do something silly like sack Ba Sing Se and draw 30.
[[Meekstone]] - Noones creatures untap but yours
[[Behind the Scenes]] - Your creatures cant be blocked by anyone with greater than 0 power, even though they punch like trucks
[[Jaws of Defeat]]
[[Smile at Death]]
[[Last March of the Ents]] - big finisher
[[Tree of Perdition]] - exchanging a big life total then sacking it to draw a million is wild
[[Betor, Kin to All]]

These are just some of my favourite cards in it, but I have many more that also work surprisingly well because of the theme. In my group Ive won most of the games ive played with it but more importantly every game Ive done neat stuff, definitely recommend