Tourach, Dread Cantordiscard$1.49It pressures the opponent's hand with discard and can scale into a stronger land-based discard effect, making it a black disruption spell in the same space. It is a creature rather than a sorcery, but it fills a similar hand-attack role.
Duressdiscard$0.19A cheaper hand-disruption spell that snipes noncreature, nonland cards before they matter. It is a budget alternative for targeted discard, though it lacks the second-card discard and graveyard exile.
Thoughtseizediscard$12.47One of the best single-card discard spells for stripping key pieces from an opponent's hand. It is narrower than Go Blank's 2-card discard plus graveyard exile, but much more efficient.
Inquisition of Kozilekdiscard$0.53Efficient early discard that trades broad coverage for a lower mana cost. It is a strong budget-friendly hand disruption option in the same general role.
Agonizing Remorsediscard$0.37This provides discard plus exile from either hand or graveyard, which overlaps with Go Blank's disruption and graveyard hate. It is a bit more flexible at the cost of only hitting one card.
Mind RotdiscardBudget$0.08A straightforward comparison point: both force card loss from the opponent's hand, though Mind Rot lacks graveyard exile. It is a simple, often budget, two-for-one discard spell.
Raven's Crimediscard$0.37Repeated discard from the hand makes it a long-game disruption tool, especially in black attrition shells. It does not exile graveyards, but it serves a similar resource-denial role.
Dauthi Voidwalkergraveyard_hate$5.02While not a sorcery, it combines graveyard exile with opponent resource denial by turning exiled cards into future value. It is a powerful replacement for the graveyard-hate half of Go Blank.