This is actually disgusting if it finds a way into aggro Paladin. Just imagine this disrupting your mana-curve and allowing the Paladin to build an even bigger board. This will be experimented with, even if it might not end up good enough in the end.
Not as good as Loatheb, but still it's interresting. A 1 off even in wild might be interesting. But this does nothing against minion-centric decks, and it is a pretty bad topdeck, so i think it's quite balanced and very good.