I used to play pure spells deck with Eithne. The one with farseers and other spell-related stuff. It wasn't very effective against certain decks, but absolutely destroyed others.
I tried to play it in HC, with Francesca of course, since now it's her ability to reuse them. And you know what, this archetype is 100% dead at the moment, especially compared to artifacts deck.
Not enough spells (due to 2 bronze limitation), not enough power behind them, not enough means to summon them from your deck if mulligan is bad, not enough ways to use them from graveyard, not enough synergy with units.
Meanwhile artifacts have it all, there are many ways to summon them, they are powerful, etc.
RIP spell'taels, long live artifacts? Pretty poor balancing...