Ghastly Discovery 
Sorcery
$0.13 #25237 0.05 18.5 years
Draw two cards, then discard a card.
Conspire (As you cast this spell, you may tap two untapped creatures you control that share a color with it. When you do, copy it.)
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Cards similar to Ghastly Discovery 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.
Memory Sluice95%
$0.41↑#223170.19↑18.5 years
"Conspire As you cast this spell, you may tap two untapped creatures you control that share a color with it. When you do, copy it and you may choose a new target for the copy."
Disturbing Plot92%
$0.16↑#254820.0018.5 years
"Conspire As you cast this spell, you may tap two untapped creatures you control that share a color with it. When you do, copy it and you may choose a new target for the copy."
Aethertow90%
$0.07↓#267040.21↑18.5 years
"Conspire As you cast this spell, you may tap two untapped creatures you control that share a color with it. When you do, copy it and you may choose a new target for the copy."
Barkshell Blessing89%
$0.12↓#277860.0618.5 years
"Conspire As you cast this spell, you may tap two untapped creatures you control that share a color with it. When you do, copy it and you may choose a new target for the copy."
Catalog88%
$0.07↓#17013↑0.0028.0 years↑
"Draw two cards, then discard a card."
Burn Trail88%
$0.17↑#296610.0618.5 years
"Conspire As you cast this spell, you may tap two untapped creatures you control that share a color with it. When you do, copy it and you may choose a new target for the copy."
Gleeful Sabotage88%
$0.20↑#19111↑0.0018.5 years
"Conspire As you cast this spell, you may tap two untapped creatures you control that share a color with it. When you do, copy it and you may choose a new target for the copy."
Rally the Galadhrim88%
$0.47↑#10845↑0.103.0 years↓
"Conspire As you cast this spell, you may tap two untapped creatures you control that share a color with it. When you do, copy it and you may choose a new target for the copy."
Giantbaiting88%
$0.09↓#284840.0018.5 years
"Conspire As you cast this spell, you may tap two untapped creatures you control that share a color with it. When you do, copy it."
Artistic Refusal88%
$0.15↑#7420↑0.37↑3.5 years↓
"• Draw two cards, then discard a card."
+1 more matching line
Mine Excavation86%
$0.23↑#207850.0018.5 years
"Conspire As you cast this spell, you may tap two untapped creatures you control that share a color with it. When you do, copy it and you may choose a new target for the copy."
Traitor's Roar86%
$0.15↑#277850.0618.5 years
"Conspire As you cast this spell, you may tap two untapped creatures you control that share a color with it. When you do, copy it and you may choose a new target for the copy."
Snow Day81%
$0.14↑#246560.155.5 years↓
"Draw two cards, then discard a card."
Rousing Read80%
$0.14↑#19624↑0.006.3 years↓
"When this Aura enters, draw two cards, then discard a card."
The Bath Song78%
$0.27↑#4983↑0.31↑3.3 years↓
"Draw two cards, then discard a card."
Confusticate and Bebother78%
$0.22↑#11318↑0.100.2 years↓
"• Draw two cards, then discard a card."
Artificer's Epiphany78%
$0.09↓#14307↑0.0711.3 years↓
"Draw two cards. If you control no artifacts, discard a card."
Sift Through Sands78%
$0.12↓#202850.28↑22.1 years↑
"Draw two cards, then discard a card."
Racers' Scoreboard77%
$0.26↑#6383↑0.001.7 years↓
"When this artifact enters, draw two cards, then discard a card."
Desperate Ravings77%
$0.05↓#15996↑0.0015.1 years↓
"Draw two cards, then discard a card at random."