Zephyr Sentinel {1}{U}
Creature — Human Soldier
Flash
Flying
When this creature enters, return up to one other target creature you control to its owner's hand. If it was a Soldier, put a +1/+1 counter on this creature.
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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.
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"When this creature enters, return up to one other target creature you control to its owner's hand."
+1 more matching line
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"When this creature enters, return up to one other target creature to its owner's hand. If you controlled it, investigate."
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"When this creature enters, return up to one other target creature to its owner's hand."
Matterbending Mage 81%
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"When this creature enters, return up to one other target creature to its owner's hand."
Air-Cult Elemental 81%
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"When this creature enters, return up to one other target creature to its owner's hand."
Winter Eladrin 81%
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"When this creature enters, return up to one other target creature to its owner's hand."