Mark Rosewater confirmed in his Blogatog, "Double-faced cards are the nail in the coffin for flip cards." I don't think we'll see new flip cards with original Kamigawa 's templating ever again
Its easy enough to get the citys blessing, so this doubles as a win condition, albeit a slow one
This isnt the deck with Seedborn Muse in it, but you could go that route anyway, making an 8/8 during everyones turn for no mana
Changing creature types on vehicles is intriguing, but Im not sure thats worth pursuing
however, realistically, a lot of the time The Scarab God will have bigger impact (I understand that thats not in this set, Im just going with a familiar example of a high impact card thats very likely to swing a game)
Enchantment - Aura Color tag templates(None) Blue Ward Enchant creature Enchanted creature has protection from blue