This card recreate the Fel Stalker unit in Warcraft III has the Mana Burn ability that burn the enemy unit equal to their mana. Gameplay wise, it's a great card to pressure control deck by mid-range and aggro decks by forcing them to either take damage or play inefficiently.
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5
I think not. Spell will triger twice time. There will be two battlecries "Your next spell this turn casts twice" not "twice as often" ;) This is my opinion.
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3
The Norse Gods :D
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This card is broken ;]