Ghastly Discovery 

Sorcery
$0.13 #25175 0.00 18.3 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 Sluice94%
$0.40↑#223330.0018.3 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 Plot90%
$0.15↑#251220.0718.3 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 Galadhrim90%
$0.54↑#10544↑0.20↑2.8 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."
Aethertow88%
$0.08↓#267530.0018.3 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."
Artistic Refusal88%
$0.17↑#7315↑0.24↑3.4 years↓
"• Draw two cards, then discard a card."
+1 more matching line
Barkshell Blessing88%
$0.09↓#273520.67↑18.3 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."
Burn Trail87%
$0.08↓#294790.50↑18.3 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 Sabotage87%
$0.20↑#18770↑0.39↑18.3 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."
Giantbaiting86%
$0.03↓#283110.0018.3 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."
Traitor's Roar85%
$0.19↑#274660.0618.3 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."
Mine Excavation85%
$0.16↑#205130.0018.3 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."
Rousing Read81%
$0.21↑#19362↑0.006.2 years↓
"When this Aura enters, draw two cards, then discard a card."
Artificer's Epiphany79%
$0.08↓#14137↑0.30↑11.1 years↓
"Draw two cards. If you control no artifacts, discard a card."