Mimic's Dagger is overpowered for the reason you listed yourself, Leeroy combo. That mana cost really is insignifcant, because you can just pre-equip it, and even swing once to make your combo easier. The only situation this card wouldn't be as good would be in a weapon-heavy meta where everyone is running removal. Staff of Frost should be worded "Characters damaged by your Hero Power are Frozen. Inspire: Lose 1 Durability." Otherwise, fine card and could help Freeze Mage stem the early game bleeding. Staff of Spiralling Madness seems like a pretty good idea, but Gorehowl is way better. This card essentially removes two large threats (given their Attack is higher than their Health) without you taking any damage, whilst Gorehowl can remove a lot more however you take damage. Thunderaan the Windseeker is a niche card. Only useful when your Hero has a weapon equipped, which is not that often in Shaman. The most common weapon is Doomhammer, which already has Windfury. Perhaps the best use of this card would be to play Hammer of Twilight on T5 for 8 damage and a Twilight Elemental. Mo'arg Scientist is a cool card. Gives a higher chance of discarding cards whilst giving a solid return.
CBBS reviewing the rest, I might do some more when I have the time. Good concepts.
I'll probably push its mana cost to 7 for mimic's dagger. I was tinkering with its cost for a bit and didn't think it was playable on 7.
Gorehowl is better if you have the life to play it. I actually stole a gorehole from warrior on turn 3 with thought steal and found I was unable to play the card in fear of cthun or gromish. This notion is even more true against aggressive decks such as midrange hunter and ect. This weapon is more appropriate for priest since they lack the ability to stack up on life.
Thunderaan the Windseeker
Though, you can pre-equip the weapon on previous turn(s). E.g stormforged axe on turn 2 -> massive tempo swing on turn 4. You can also combo this card with rockbitter weapon. Wait until turn 5 and then, 6 damage tempo swing. It also combos with spirit claws, so you can use all the weapon charges on a turn where you have spell damage.
The card isn't for aggro shaman. It's orientated towards a control shaman.
http://imgur.com/a/TTADV
Imgur features my reasoning for each card so I've elected to leave everything on there.
Mimic's Dagger is overpowered for the reason you listed yourself, Leeroy combo. That mana cost really is insignifcant, because you can just pre-equip it, and even swing once to make your combo easier. The only situation this card wouldn't be as good would be in a weapon-heavy meta where everyone is running removal.
Staff of Frost should be worded "Characters damaged by your Hero Power are Frozen. Inspire: Lose 1 Durability." Otherwise, fine card and could help Freeze Mage stem the early game bleeding.
Staff of Spiralling Madness seems like a pretty good idea, but Gorehowl is way better. This card essentially removes two large threats (given their Attack is higher than their Health) without you taking any damage, whilst Gorehowl can remove a lot more however you take damage.
Thunderaan the Windseeker is a niche card. Only useful when your Hero has a weapon equipped, which is not that often in Shaman. The most common weapon is Doomhammer, which already has Windfury. Perhaps the best use of this card would be to play Hammer of Twilight on T5 for 8 damage and a Twilight Elemental.
Mo'arg Scientist is a cool card. Gives a higher chance of discarding cards whilst giving a solid return.
CBBS reviewing the rest, I might do some more when I have the time. Good concepts.
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I'll probably push its mana cost to 7 for mimic's dagger. I was tinkering with its cost for a bit and didn't think it was playable on 7.
Gorehowl is better if you have the life to play it. I actually stole a gorehole from warrior on turn 3 with thought steal and found I was unable to play the card in fear of cthun or gromish. This notion is even more true against aggressive decks such as midrange hunter and ect. This weapon is more appropriate for priest since they lack the ability to stack up on life.
Thunderaan the Windseeker
Though, you can pre-equip the weapon on previous turn(s). E.g stormforged axe on turn 2 -> massive tempo swing on turn 4. You can also combo this card with rockbitter weapon. Wait until turn 5 and then, 6 damage tempo swing. It also combos with spirit claws, so you can use all the weapon charges on a turn where you have spell damage.
The card isn't for aggro shaman. It's orientated towards a control shaman.