Winter Sky 
Sorcery
Flip a coin. If you win the flip, Winter Sky deals 1 damage to each creature and each player. If you lose the flip, each player draws a card.
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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.
Stitch in Time 97%
$1.35#5083
"Flip a coin. If you win the flip, take an extra turn after this one."
Odds // Ends 89%
$0.49#25752
"Flip a coin. If it comes up heads, counter target instant or sorcery spell. If it comes up tails, copy that spell and you may choose new targets for the copy."
Puppet's Verdict 83%
$4.52#13327
"Flip a coin. If you win the flip, destroy all creatures with power 2 or less. If you lose the flip, destroy all creatures with power 3 or greater."
Aleatory 82%
$0.40#18780
"Flip a coin. If you win the flip, target creature gets +1/+1 until end of turn."