Decent card that can be compared to loot hoarder. were loot is in general drawing a better card this enables elementals. But mage is so heavily around random stuff it doesnt look to consistant so i guess tier 3-2 max for jaina this set.
Taking account that Babbling Book already exist (which does the same thing and is much better in every sense) I would have given this card another different and, above all, innovative effect (because it seems that Hearthstone developers are lacking of new ideas):
"Deathrattle: Add to your hand a random spell that has been played this game."