Alhammarret, High Arbiter {5}{U}{U}
Legendary Creature — Sphinx
Flying
As Alhammarret enters, each opponent reveals their hand. You choose the name of a nonland card revealed this way.
Your opponents can't cast spells with the chosen name (as long as this creature is on the battlefield).
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Cards that do something similar expected a card that isn't here?
Reports become test cases the matcher is graded against before an update ships. Delvefall isn't a chatbot guessing, it compares the printed rules text of every card with plain math, and examples like yours decide which differences should count.
Valki, God of Lies // Tibalt, Cosmic Impostor 99%
$3.87#5949
"When this card enters, each opponent reveals their hand. For each opponent, exile a creature card they revealed this way until this card leaves the battlefield."
Jennifer Walters // The Sensational She-Hulk 90%
$14.40#12167
"Your opponents can't cast spells during your turn."
Megatron, Tyrant // Megatron, Destructive Force 90%
$2.08#11410
"Your opponents can't cast spells during combat."
Teferi, Time Raveler 90%
$7.25#1139
"Each opponent can cast spells only any time they could cast a sorcery."
Teferi, Mage of Zhalfir 90%
$3.05#4358
"Each opponent can cast spells only any time they could cast a sorcery."
Drannith Magistrate 87%
$14.78#698
"Your opponents can't cast spells from anywhere other than their hands."
Inventive Iteration // Living Breakthrough 87%
$0.30#9276
"Whenever you cast a spell, your opponents can't cast spells with the same mana value as that spell until your next turn."
Godsend 86%
$3.67#7903
"Your opponents can't cast spells with the same name as a card exiled with this card."
Circu, Dimir Lobotomist 86%
$0.65#18392
"Your opponents can't cast spells with the same name as a card exiled with this card."