Flash 

Instant
You may put a creature card from your hand onto the battlefield. If you do, sacrifice it unless you pay its mana cost reduced by {2}.
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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.
Through the Breach 97%
$0.43#17490
"You may put a creature card from your hand onto the battlefield. That creature gains haste. Sacrifice that creature at the beginning of the next end step."
Cauldron Dance 97%
$0.35#13003
"You may put a creature card from your hand onto the battlefield. That creature gains haste. Its controller sacrifices it at the beginning of the next end step."
Dramatic Entrance 85%
$1.24#21112
"You may put a green creature card from your hand onto the battlefield."
Lure of Prey 85%
$3.64#23226
"You may put a green creature card from your hand onto the battlefield."
Caravan Vigil 84%
$0.17#12807
"You may put that card onto the battlefield instead of putting it into your hand if a creature died this turn."