Ydwen Efreet 
Creature — Efreet
$70.25 #28115 0.28 32.7 years
Whenever this creature blocks, flip a coin. If you lose the flip, remove this creature from combat and it can't block this turn. Creatures it was blocking that had become blocked by only this creature this combat become unblocked.
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Cards similar to Ydwen Efreet 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.
Mijae Djinn80%
$1.15↓#21114↑0.06↓32.7 years
"Whenever this creature attacks, flip a coin. If you lose the flip, remove this creature from combat and tap it."
Fickle Efreet72%
$0.47↓#21702↑0.2426.3 years↓
"Whenever this creature attacks or blocks, flip a coin at end of combat. If you lose the flip, an opponent gains control of this creature."
Gustcloak Sentinel70%
$0.08↓#296690.2023.9 years↓
"Whenever this creature becomes blocked, you may untap it and remove it from combat."
Gustcloak Runner70%
$0.07↓#297510.00↓23.9 years↓
"Whenever this creature becomes blocked, you may untap it and remove it from combat."
Gustcloak Skirmisher70%
$0.06↓#285250.06↓23.9 years↓
"Whenever this creature becomes blocked, you may untap it and remove it from combat."
Gustcloak Harrier70%
$0.16↓#271090.00↓23.9 years↓
"Whenever this creature becomes blocked, you may untap it and remove it from combat."