To be honest, Bloodmage Thalnos is such an integral part of most decks with damage based removal because of the card draw and the spell damage. You can replace it, but you have to choose between spell damage or card draw of the same mana cost to replace it.
I've been messing around with reno shaman. Sounds crazy, but with all the board clears, I think with the right mix of minions to gain board control, it can be very OP. I did go 2-0 vs pirate warrior ( rank 14 ).