How can you enchant Zur with Diplomatic Immunity and then other stuff? Doesn't shroud prevent him from being targeted by either player?

when you use Zur's ability, you do not need a target since you do not play the spell, you just put it into play.

Ohh ok. So it just get's put into play directly and you can attach it since you aren't "casting'' it?

Aura's only target when they r cast. Abilities that put them into play can enchant things with shroud because they don't target. Zur and replenish are both examples of this.

The deck must look absolutely beautiful, and I did not know their was a foil mana crypt, or is it the promo?

thank you it does! and the mana crypt is the judge promo foil. i won't be fully foiling it however... i find i like the textless cards, unhinged basics and signed fetches well enough as they are.

I would recommend Reconnaissance as your first go to enchantment. It allows you to trigger Zur, but drop him out of combat to avoid any of those combat related creature removals (and just avoid overall combat damage). And it's a 0 cost ability.