Scholomance Academy Cards List & Guide
Hero Power should be: Summon a Random Rune in replace of your hero power.
Blood Rune: 0 Mana: Give a minion +2 Attack this turn only
Frost Rune: 0 Mana: Give a minion +1 Health
Unholy Rune: 0 Mana: Raise a 1/1 ghoul with charge that dies at the end of the turn.
Maybe add a card called "Blood Tap": 4 Mana: Deal 3 Damage to your hero and make your hero power a Death Rune
Death Rune: 0 Mana: Destroy a Minion
Also make the Sword of the Ebon Blade or whatever it is, just the opposite of Sword of Justice, with 1/5 and loose 1 durability for every time the effect happens.
Just my 2 cents besides the art everything looks fine :P
I Designed A Card This Week