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1) Priestly Breastplate might work out for you, but one of the best strategies in Green/Teal is to use Jeremiah or Zechariah with Hidden Treasures, then use Burning Incense. To use Zechariah, you either need HoH or Altar of Incense up so it isn't negated. Altar of Incense makes BI CBN, so it would get around Priestly Breastplate.
2) In T2, you can have up to five of any character or enhancement in a deck of any size, except multicolor, and you can have three of any Artifact, Curse, Covenant, or Fortress. 1 per 50 only applies to SA Sites and LS's.
3) I'm not a type 2 player myself, but I'm pretty sure the deck is way too big to be competitive. Also, think of all the cards you have just one of. With only two searches, you will rarely if ever draw those cards. Go for smaller, and more streamlined deck construction. Most T2 players I know adhere to the philosophy that you have 3-5 different enhancements, and between 2-5 copies of each of them, for offense and defense.
I am not well versed in a T2 green offense but I do know that Provisions is amazing. Jeremiah and Habakkuk make it even better because they get around one of it's counters, KotW.On defense I'd use more Swift Horses. The one Apprehended should be another Carried Into Exile or Head of Gold.
If you really want to get the Hur + Gifts combo, you probably need at least one more Hur, otherwise you'll likely not draw him very often.
Are you going to be using Captured Ark as an enhancement or an artifact? If the latter, you may want to add another to help guarantee you'll get the effect sometime during your games.
I'd suggest some artifact destruction. 1 blue tassels hurts your defense really bad.
Congrats! Well done! It looks like all your hard work to prep your deck paid off.