Symbol of Unsummoning 
Sorcery
$0.11 #28378 0.15 29.5 years
Return target creature to its owner's hand.
Draw a card.
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Cards similar to Symbol of Unsummoning 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.
Repulse100%
$0.11#8587↑0.1426.0 years↓
"Return target creature to its owner's hand."
+1 more matching line
Drag Under100%
$0.05↓#17943↑0.33↑10.2 years↓
"Return target creature to its owner's hand."
+1 more matching line
Drown in Shapelessness97%
$0.20↑#269420.74↑8.3 years↓
"Return target creature to its owner's hand."
Unsummon97%
$0.08↓#2807↑0.1333.2 years↑
"Return target creature to its owner's hand."
Arrester's Admonition96%
$0.05↓#18959↑0.00↓7.7 years↓
"Return target creature to its owner's hand."
Crashing Tide92%
$0.05↓#20266↑0.058.8 years↓
"Return target creature to its owner's hand."
+1 more matching line
Stern Dismissal91%
$0.16↑#11556↑0.066.7 years↓
"Return target creature or enchantment an opponent controls to its owner's hand."
Dramatic Rescue91%
$0.10↓#20599↑0.00↓14.0 years↓
"Return target creature to its owner's hand. You gain 2 life."
Inside Out91%
$0.19↑#21084↑0.1218.2 years↓
"Draw a card."
Eyes of Gitaxias91%
$0.11#20930↑0.00↓3.5 years↓
"Draw a card."
Contentious Plan91%
$0.37↑#2198↑0.147.5 years↓
"Draw a card."
Steady Progress91%
$0.26↑#5093↑0.0616.1 years↓
"Draw a card."
Unexplained Disappearance90%
$0.21↑#17351↑0.38↑8.0 years↓
"Return target creature to its owner's hand."
Temporal Machinations90%
$0.23↑#285910.25↑8.5 years↓
"Return target creature to its owner's hand. If you control an artifact, draw a card."
Healing Hands90%
$0.19↑#19707↑0.00↓11.3 years↓
"Draw a card."
Call to Heel90%
$0.05↓#18424↑0.00↓18.0 years↓
"Return target creature to its owner's hand. Its controller draws a card."
Galestrike90%
$0.12↑#21469↑0.00↓9.5 years↓
"Return target tapped creature to its owner's hand."
+1 more matching line
Seal of Removal89%
$0.15↑#6818↑0.28↑26.7 years↓
"Sacrifice this enchantment: Return target creature to its owner's hand."
Honor89%
$0.29↑#6549↑0.00↓1.2 years↓
"Draw a card."
Smash88%
$0.08↓#18320↑0.30↑25.4 years↓
"Draw a card."