for instance, know how badly you will screw your allies with Oblivion.
That's why I love Visionary+Nightmist. (yes I know, I pretty much think Visionary should be on every team)
A little Twist the Ether and cards like Oblivion aren't nearly as risky. Make the first damage cold for AZ, or drop it one to save you teammates, then pump up the other side for the damage. There's a lot of other ways they really work well together.
As for card counting it's also interesting to look at what cards have what numbers.
Like the 1's include a bunch of your better spells: Banishment, Oblivion, Lash, Enlightenment and Mistbound; as well as a starshield necklace.
The 4's include Mistbound and Oblivion, but the other ones are much more expendable.
All four relics have a 3, so if you have some non-3 relics and a call forth, you can fuel Starshield pretty well grabbing those relics.
Of the nine Relics you have: 1 four, 4 threes, 2 twos, and 2 ones.
Spell cards: 5 fours, 6 threes, 6 twos, and 6 ones.
Yeah despite there being a lot of threes, there are pretty even numbers of spell cards. Cards that can't be pulled from your deck except by drawing them: 2 fours, 3 threes, 3 twos, 0 ones.
What does this tell you?
First don't be afraid to pull all your relics for discards, they aren't too much in any direction, and you can starshield necklace them.
Second, it seems to me that Tome of Elder Magic isn't too bad of an idea if you don't need tons of cards to reflect damage or to be dealing damage with investigation, it is more likely to thin out those ones, (esp if you pull relics too) and leave you with more high numbers than low ones. Again Non-spell cards: 3 fours, 7 threes, 5 twos, 2 ones. That gives you pretty good numbers for playing magic.
Also our good friend Mists of Time is great if you can get a bunch of high number cards in your trash early with a few Oblivions in your hand. It doesn't happen much, but when it does go ahead and kill your friends, it's not your fault they aren't immune to infernal damage. (although if you have a Tachyon and Legacy and a +1 damage from the environment it's awfull fun to hit the big bad guy for 32 damage with Oblivion. Using Amulet and Call Forth is a great way to pull this off. Even if you flip it with 4 or 5 cards, just don't draw your first turn.