The first priority of the deck is solidifying your threshold. 99% of the deck only needs 2 of each threshold, and with all the unique lands + Shrine of the Dragonlord, it makes it achievable quickly. Usually turn 2 or 3 and you no longer need to worry about threshold from around 100 tests so far.
The second priority of the deck is reinforcing and discounting where possible. Chronically you're going to be comboing various effects off each other. Here's a few examples of the combo synergies:
Camelot + Mirror Realm: Makes prices negligible for pretty much every minion.
Four Waters + Mordred/Lancelot/Galahad/Lamorak/etc.: This can get you early board control while you're building up your synergies.
Highland Princess + Geistwood: Use to immediately get your ring(s), and then any other castings you use to kill the princess with the ring to get back life and also your second ring. If you've already got one or both out, you then go for either the Philosopher's Stone or Kythera mechanism depending on your situation.
Geistwood/Saintweald + Lamorak/Mordred/etc.: This gets ridiculous and is great for board control and quickly getting rid of larger minions.
Lamorak + Saintweald + Blaze of Glory: Gets absolutely ridiculous in both clearing the board and nuking an opponent.
2x Camelots/1x Camelot+1x Mirror Realm + 2x Sir Tom Thumb + The Round Table + Ring of Morrigan: You win. It happens more often than you'd think, and lets you basically sift your spelllbook till you get what you want. Especially with some of the other combos above.
Kythera Mechanism+13 Treasures+Sir Bedivere: Accelerates resolving the starting card deficit issue for the deck.
Evil twin is a fantastic counter to things like the Doom of Dilmuun or other creatures you need to shut down.
***Note 6/4: Garden of Eden I'm finding to hinder more often than help, I may advise removal for a different site, I'm toying with options here right now.