Zimone's Hypothesis 
Instant
$0.23 #8407 0.19 1.9 years
You may put a +1/+1 counter on a creature. Then choose odd or even. Return each creature with power of the chosen quality to its owner's hand. (Zero is even.)
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Cards similar to Zimone's Hypothesis 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.
Wave Goodbye78%
$2.01↑#1519↑0.46↑2.8 years
"Return each creature without a +1/+1 counter on it to its owner's hand."
Extinction Event73%
$0.37↑#99810.80↑6.4 years↑
"Choose odd or even. Exile each creature with mana value of the chosen quality."