Unless extreme, these errors dont prevent a card from receiving a high grade
The set seems to have fairly high complexity, with a whole host unique cards, cards with many lines of text, and cards which are archetypes unto themselves

Blackmail Target player reveals three cards from their hand and you choose one of them for that player to discard Duress Target opponent reveals their hand and you choose a noncreature, nonland card for that player to discard Encroach Target player reveals their hand and you choose a nonbasic land card for that player to discard (can hit non-basic lands!!) Grief A 3/2 creature with Evoke (Evoke cost is exile a black card from your hand) When it enters the battlefield, target opponent reveals their hand and you choose a nonland card for that player to discard Inquisition of Kozilek Target player reveals their hand and you choose a nonland card from it with mana value 3 or less for that player to discard Mires Toll Target player reveals a number of cards from their hand equal to the number of Swamps you control and you choose one of them for that player to discard Thoughtseize Target player reveals their hand and you choose a nonland card for that player to discard you lose 2 life Unmask Exile a black card from your hand rather than pay this spells mana cost Target player reveals their hand and you choose a nonland card for that player to discard There are tons and tons of Black discard effects in MTG

For under three dollars, its a low-risk addition that adds a splash of professional-tier art to any collection
What it does have is a dramatically high damage attack, dealing 150 in total, plus 20 more to everything on the bench
Theyve been on top of the Commander game since way before Flash was banned