Xantid Swarm 
Creature — Insect
$4.02 #14052 0.41 23.3 years
Flying
Whenever this creature attacks, defending player can't cast spells this turn.
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Cards similar to Xantid Swarm 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.
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$0.17↓#20427↓0.08↓11.6 years↓
"As long as this creature is attacking, defending player can't cast spells."
+1 more matching line
Silence86%
$7.51↑#407↑1.51↑17.1 years↓
"Your opponents can't cast spells this turn."
Angelic Arbiter80%
$3.30↓#5101↑0.94↑16.1 years↓
"Each opponent who cast a spell this turn can't attack with creatures."
Wings of the Guard79%
$0.14↓#23912↓0.20↓10.0 years↓
"Flying"
Tidal Barracuda78%
$7.59↑#4364↑0.63↑6.4 years↓
"Your opponents can't cast spells during your turn."
Cease-Fire76%
$0.14↓#24016↓0.4724.9 years↑
"Target player can't cast creature spells this turn."
Nightveil Sprite76%
$0.11↓#7481↑0.05↓7.9 years↓
"Flying"
Voice of Victory76%
$17.12↑#535↑0.95↑1.4 years↓
"Your opponents can't cast spells during your turn."
Dragonlord Dromoka76%
$1.94↓#1882↑0.65↑11.4 years↓
"Your opponents can't cast spells during your turn."
Angelic Captain75%
$0.24↓#19988↓0.00↓10.9 years↓
"Flying"
Spellbound Dragon74%
$0.34↓#20768↓0.61↑17.3 years↓
"Flying"
Ragefire Hellkite73%
$0.24↓#19802↓0.53↑4.0 years↓
"Flying"
Steel-Plume Marshal73%
$0.27↓#7442↑0.00↓6.1 years↓
"Flying"
Orim's Chant72%
$6.74↑#1856↑1.12↑25.6 years↑
"Target player can't cast spells this turn. If this spell was kicked, creatures can't attack this turn."
Ancestor Dragon72%
$0.27↓#140250.56↑8.2 years↓
"Flying"
Sphinx of Forgotten Lore71%
$0.36↓#8965↑0.23↓1.8 years↓
"Flying"
Kelinore Bat70%
$0.09↓#28728↓0.00↓17.1 years↓
"Flying"
Living Tempest70%
$0.08↓#29974↓0.435.9 years↓
"Flying"
Flameblast Dragon70%
$0.25↓#9240↑0.05↓17.9 years↓
"Flying"
Scion of Ugin70%
$0.10↓#23935↓0.4011.4 years↓
"Flying"