Psychic Rebuttal 
Instant
$0.20 #20057 0.19 11.1 years
Counter target instant or sorcery spell that targets you.
Spell mastery — If there are two or more instant and/or sorcery cards in your graveyard, you may copy the spell countered this way. You may choose new targets for the copy.
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Cards similar to Psychic Rebuttal 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.
Odds // Ends85%
$0.41↑#26083↓0.31↑20.3 years↑
"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."
Extinguish84%
$0.25↑#27936↓0.60↑28.2 years↑
"Counter target sorcery spell."
Envelop84%
$3.31↑#205820.60↑24.3 years↑
"Counter target sorcery spell."
Twincast84%
$6.50↑#6258↑0.00↓21.3 years↑
"Copy target instant or sorcery spell. You may choose new targets for the copy."
Reverberate84%
$2.95↑#1406↑0.35↑16.1 years↑
"Copy target instant or sorcery spell. You may choose new targets for the copy."
Swarm Intelligence84%
$0.36↑#4702↑0.37↑9.1 years↓
"Whenever you cast an instant or sorcery spell, you may copy that spell. You may choose new targets for the copy."
Split Decision84%
$1.84↑#7198↑0.2512.2 years↑
"Choose target instant or sorcery spell. Starting with you, each player votes for denial or duplication. If denial gets more votes, counter the spell. If duplication gets more votes or the vote is tied, copy the spell. You may choose new targets for the copy."
Dispel83%
$0.28↑#919↑0.33↑16.6 years↑
"Counter target instant spell."
Miscast83%
$1.20↑#2696↑0.31↑6.2 years↓
"Counter target instant or sorcery spell unless its controller pays 
."
."
Double Vision83%
$0.60↑#2730↑0.43↑6.2 years↓
"Whenever you cast your first instant or sorcery spell each turn, copy that spell. You may choose new targets for the copy."
Meletis Charlatan83%
$0.15↓#213350.1212.9 years↑
"
, 
: The controller of target instant or sorcery spell copies it. That player may choose new targets for the copy."
, : The controller of target instant or sorcery spell copies it. That player may choose new targets for the copy."
Muddle the Mixture82%
$1.84↑#694↑0.44↑20.9 years↑
"Counter target instant or sorcery spell."
Obscura Charm80%
$0.22↑#8540↑0.294.4 years↓
"• Counter target instant or sorcery spell."
Reiterate80%
$18.90↑#2568↑0.36↑19.9 years↑
"Copy target instant or sorcery spell. You may choose new targets for the copy."
Nivix Guildmage80%
$0.11↓#162530.00↓13.9 years↑
"
: Copy target instant or sorcery spell you control. You may choose new targets for the copy."
: Copy target instant or sorcery spell you control. You may choose new targets for the copy."
Dualcaster Mage80%
$3.74↑#666↑0.70↑11.8 years
"When this creature enters, copy target instant or sorcery spell. You may choose new targets for the copy."
Mirari80%
$0.42↑#15206↑0.88↑24.9 years↑
"Whenever you cast an instant or sorcery spell, you may pay . If you do, copy that spell. You may choose new targets for the copy."
. If you do, copy that spell. You may choose new targets for the copy."
Flusterstorm80%
$4.99↑#307↑0.70↑15.2 years↑
"Counter target instant or sorcery spell unless its controller pays ."
."
Sevinne, the Chronoclasm80%
$0.25↑#202340.71↑7.0 years↓
"Whenever you cast your first instant or sorcery spell from your graveyard each turn, copy that spell. You may choose new targets for the copy."
Echo Mage80%
$0.29↑#162090.50↑16.4 years↑
", : Copy target instant or sorcery spell. You may choose new targets for the copy."
, : Copy target instant or sorcery spell. You may choose new targets for the copy."+1 more matching line