Maelstrom Bell interactions. Testing out Maelstrom bell (I know these will probably all be obvious but I wanted to check anyway):  

Channel the Tempest (gets a little +X in the card text)  
Flame Blast (as expected - cannot cast at 0 mana though)
Piercing shot (does +1 to both player and unit)  
Rock Slide becomes "Deal (2+X)... or Deal (1+X) to two enemies"   
Flash fire works as expected

Went through the testing as it did not interact with Dragon's Breath at all, which I found unexpected. In hindsight, it seems this was due to it causing the minion to do the damage, opposed to being a damaging spell. However since I checked, I thought I may as well share.