Skittish Valesk {6}{R}
Creature — Beast
At the beginning of your upkeep, flip a coin. If you lose the flip, turn this creature face down.
Morph {5}{R} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its morph cost.)
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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.
Planar Chaos 88%
$2.25#7067
"At the beginning of your upkeep, flip a coin. If you lose the flip, sacrifice this enchantment."
Scoria Wurm 84%
$0.49#20573
"At the beginning of your upkeep, flip a coin. If you lose the flip, return this creature to its owner's hand."