Are we on the same page?
Fahrenheit damage can be healed, Shard of Void damage can not be healed.
Your opponents HP looks like this 98/98, 96/96, 94/94, 92/92, 90/90, and so on.
I thought the idea of the deck was to make healing useless.
If I had a Fahrenheit I would use it only in conjuntion with the final Fire Bolts.