Its a much more rare kind of black deck which wholly embraces discard spells including non-targeted ones and the attritional approach to gameplay they encourage
Five mana is a little slow, but I think this could really play well in an Academy Rector role an easy-to-cheat-in stepping stone which opens new routes to payoffs like Bolass Citadel
Mystical Tutor, Worldly Tutor, Sylvan Tutor, Personal Tutor, and Enlightened Tutor are all one-mana tutor options that can find specific types of cards
Even though most of these are (surprisingly) not assassins themselves, they synergise so well with the cards from the last section that Id consider them essential support cards
Thus the power is ripe for unleashing on folks
With Oswalds Favorable Chance ability, every time you put a card in your inkwell you can choose to reveal the top card of your deck