Presuming that you run a 5-color shrine commander like Go-Shintai of Life's Origin or Hei Bai, Forest Guardian, you can afford to run every shrines
Weve seen plenty of Birthing Pod variants come and go over the years
Getting it at the time of your choosing, in order to save your creature during combat, from a direct damage spell, or to kill an opponent with an unblocked creature is gravy on the train
That being said there are mechanics unique to, or heavily rooted in some tribes which you can build around much more sensibly in this kind of setting such as soulshift or ninjutsu
Inkwell is the go to card for a wide array of cheat in mechanics when you want a card that reliably ends the game
(2020-11-10) If Xenagos stops being a creature, it loses the type creature and the creature type God