Hello Vulcan. I am 100% sure that my gf would beat you with this book.

(she tends to rush mostly)
You only have mghedden, so no defensive creatures and Mghedden is only active from turn 4 on.
This means that you will probably get a LOT of damage during turn 3 and 4 damaging you too much to come back from that. Since mhgeddon does 6 damage to you too you are pretty vulnerable.
If you want to rush, I highly suggest different demons. Kharn or afflicted demon are probably my picks (supported with elusive enchantments/incantations)
Piercing thunderstrike is good, but I don't think it's worth it since fire is in school. (at least drop 1)