A little perspective for you is the black tutor, Cruel Tutor is found in more than 8,000 Commander decks according to EDHREC, and Harrowing Journey was playable during Dark Ascension Limited, so a Sign in Blood is certainly worth consideration
A quick sanity check saves headaches later
Liliana, Heretical Healer is a classic Aristocrats card, seeing play both in the 99 and leading decks of her own
The dilemma lies in the fact that if everybody chooses to do the same thing (silence, snitching), you always get some kind of punishment
"Sphynx" mills the top card of the Deck), losing "Basilitrice" to a card effect or having its Summon negated is a heavy punishment in terms of card advantage
This first place deck by EC_Sergent Tibs leans heavily into the brand new Hades card