Why didn’t the spell: Ice Block come in the spell: Jaina’s Gift???
Why don’t you create strong and interesting cards for mages?? If you’re a mage, you keep getting this rubbish in the form of cards, so annihilate the mage class at once and completely dust off all the rubbish cards that mages always get!!
Because nobody wants to play against eight Ice Blocks.
As we currently play against 8 ice blocks 
In your dreams… in my dream there would be more than 20!! 
As elemental shaman once I killed ice block jaina by triggering the secret and dropping her to 1 hp, then playing ashen elemental (opponent take 2 damage with every card draw next turn) She took damage before she could play another ice block. Felt pretty good.
Your question gets posted on the frontpage - thats how this hearthstone forum works, so posting the same question in 2 different forums just makes you seem insane