You'll want about 15 of these, since this is your main quanta source.
1 Owl's Eye is fine. If you have it, 2 don't hurt at all.
6 Quintessence will do the trick.
This is your main and only attacking source. Have 6 of them.
Have 3 or 4 on hand. I use 3.
The idea is to use Owl's Eye, get out a Crusader, have him Endow your weapon, and snipe every enemy creature. Use Quintessence to defend against Reverse Time, etc.
If your foe has a good weapon out, it is okay to Endow it instead of Owl's Eye.
This deck gets the job done without upgrades, but if you can, upgrade in the following order:
1)Owl's Eye 2)Quintessence 3)Crusader 4)Quantum Pillar 5)Dimensional Shield