These cards are bread and butter to most black decks
Atraxa, Grand Unifier One of the best ETB creatures in the game, Atraxa, Grand Unifier puts on a show at cEDH tournaments, and at one point claimed a 20% share of the metagame on MTG Top 8
I love Billy strings also
Some of them are easier to spot, like the kind of entire holographic thing
Regional Whitebeard (~US$1,000) This alternate art version of a card that was originally part of the Paramount War [OP-02] expansion has a high value stemming from three sources: the fact that its awarded as a prize for those who place in the top 16 of the current regional season, the popularity of the character it depicts, and the cards high level of viability within the metagame
At the end of the day this is a 1-mana tutor and that is generally going to lead to high levels of redundancy and consistency in decks and this is no exception