The Ring gains its abilities in order from top to bottom
Jund is going to try and run you out of resources, which seems like a particularly poor strategy in the face of buying back Fact or Fiction with Mystic Sanctuary
You also cant respond to special game actions like playing a land, paying costs (including for effects like Rhystic Study or Leonin Arbiter), or flipping a morphed or manifested creature face up
If youre chasing the Giratina V SA specifically, buying the single at ~$984 saves thousands compared to opening boxes
Stay in the combat phase and the Elder is still an attacking creature, begin again with the Maze and continue until you have as much mana as you need
This seriously restricted the land choices, making some of the cards appearing on the Bonus Sheet somewhat awkward, but there remain some very expensive chase cards for players to try and acquire