The mistakes that we have made in the past are learning tools, so they help us move though life
Often Geist will find himself suicided into something that will obviously kill or trade with him so as to snipe down a planeswalker with the evasive angel token
Sephiroths deck is all about him
It's a great threat to resolve against control because the enchantments don't have to resolve to produce the Angel tokens, and they also survive Back to Nature
I'm not sure how many strictly Colorless lands you want in a deck like this, especially if your second color is white for wrath effects or a token theme with Caretaker's Talent
The Great Henge isnt as easy to cast as Guardian Project, but if you do the heavy lifting necessary to cast this at a reasonable cost, you get the bonus of extra mana and lifegain each turn, and your creature cards that enter the battlefield get a +1/+1 counter on them, in addition to the card draw