What's double handed? 
Also, free Lightning, Reverse Time, Shockwave/Freeze, and various other 1-2 cost CC spells. Seems too easy to invalidate elemental restrictions for good cards.
Double handed uses both weapon and shield slots,
but it doesn't means Double handed is both a weapon and shield,
you will have to see in the ability text whether it is a weapon or shield
or none of the above.
Book of Sprites is to make control decks more playable, Lightning, Reverse Time, Shockwave/Freeze can creature control very well,
but they are unable to inflict serious damage to opponent's player HP, so control decks will probably have 1 Immortal or Phase Dragon
to deal the player damage.