A first attempt at this can be found here: http://elementstheforum.smfforfree3.com/index.php/topic,407.0.html
Still needs some more work though.
Here's a copy of my post from over in the other thread for AI3 rares.
So far this is what I've run into. I'll try to update as I find out new info.
I put what I've seen in the game or spinners in Bold and what others have seen in italics.
Number of Cards before they draw their 7 cards; Mark; Pillars: Rares
36; Air Mark; Life and Air:
Druidic Staff, Owl's Eye37; Death Mark; Death and Darkness:
Vampire Stilleto38; Light Mark; Life, Air, Light:
Morning Star, Miracle, Druidic Staff38; Air Mark; Air, Light, Life:
Druidic Staff, Owl's Eye40; Gravity Mark; Light, Gravity:
Titan, Morning Star40; Time Mark; Time:
40; Water Mark; Water and Death:
Trident, Arctic Squid, Arsenic40; Entropy Mark; Entropy and Darkness:
Discord, Vampire Stiletto44; Time Mark; Time and Aether:
Eternity45; Death Mark; Death and Fire:
Fahrenheit58; Life Mark; Light, Life, Quantum:
Druidic Staff, Pulverizer