For me it’s the MAGE 2 Mana card.
Book of Specters.
Draw 3 cards. Discard any spells drawn.
What is this card about? What Mage doesn’t have spells? How do you use it? When you end up random with one of these i have no idea what to do with it, it’s more frustrating than Gnomish Experimenter.
breath.
What’s your Least favourite card to use in the game?
Arcane intellect, it’s “too” expensive in most mage decks. I can see 2 mana being too good so there isn’t really anything to do and I’ll have to keep using it. In fact it seems the existence for research project and book of specters to exist is to show how much you wish you had a 2 mana arcane intellect without the drawbacks. Because research project just feels SO good in terms of cost and card draw but the drawback is huge.
I also hate using book of specters.