Blue Bead and Mystic Balance (Mysterea boon) work togather in an interesting way, too. If you keep a few low level monsters (popcorn) alive until the boss fight begins, and you have Mystic Balance and some exploration left, what happens is:
You cast a fireball for 5 mana.
You cast Bloodtopowa, get 3 mana back. You kill a low level monster and get 1 more mana back from the bead. You drink the bloodpool and get 1 more mana back, as well as 20+% of your health (to compensate for the B2P).
You cast another fireball for 5 mana.
Repeat untill you run out of blackspace for Bloodtopowa or popcorn.
Also halflings and dwarves make good bloodmages (halflings can use health pots to regein mana using B2P, and dwarves can use B2P more because of their large health, as well as get mor regeneration from sanguine). You can try that as well, it's been fun.