Unbound Flourishing {2}{G}
Enchantment
Whenever you cast a permanent spell with a mana cost that contains {X}, double the value of X.
Whenever you cast an instant or sorcery spell or activate an ability, if that spell's mana cost or that ability's activation cost contains {X}, copy that spell or ability. You may choose new targets for the copy.
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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.
Thousand-Year Storm 93%
$1.37#1394
"Whenever you cast an instant or sorcery spell, copy it for each other instant and sorcery spell you've cast before it this turn. You may choose new targets for the copies."
Double Vision 92%
$0.60#2668
"Whenever you cast your first instant or sorcery spell each turn, copy that spell. You may choose new targets for the copy."
Chandra, Hope's Beacon 92%
$2.62#4076
"Whenever you cast an instant or sorcery spell, copy it. You may choose new targets for the copy. This ability triggers only once each turn."
Sevinne, the Chronoclasm 92%
#19831
"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."
Galvanic Iteration 91%
$0.26#2918
"When you next cast an instant or sorcery spell this turn, copy that spell. You may choose new targets for the copy."
Pigment Wrangler // Striking Palette 91%
$0.10#18650
"When you next cast an instant or sorcery spell this turn, copy that spell. You may choose new targets for the copy."
Doublecast 91%
$0.21#11121
"When you next cast an instant or sorcery spell this turn, copy that spell. You may choose new targets for the copy."
Howl of the Horde 91%
$0.24#13504
"When you next cast an instant or sorcery spell this turn, copy that spell. You may choose new targets for the copy."
Teach by Example 91%
$0.12#7586
"When you next cast an instant or sorcery spell this turn, copy that spell. You may choose new targets for the copy."
Swarm Intelligence 91%
$0.39#4549
"Whenever you cast an instant or sorcery spell, you may copy that spell. You may choose new targets for the copy."
Orvar, the All-Form 91%
$3.15#5496
"Whenever you cast an instant or sorcery spell, if it targets one or more other permanents you control, create a token that's a copy of one of those permanents."
+1 more matching line
Bill Potts 90%
$0.18#22529
"Whenever you cast an instant or sorcery spell that targets only this card or activate an ability that targets only this card, copy that spell or ability. You may choose new targets for the copy. This ability triggers only once each turn."
Djinn Illuminatus 90%
$0.32#17031
"Each instant and sorcery spell you cast has replicate. The replicate cost is equal to its mana cost."
Melek, Izzet Paragon 89%
$0.13#7208
"Whenever you cast an instant or sorcery spell from your library, copy it. You may choose new targets for the copy."
Invasion of Arcavios // Invocation of the Founders 88%
$0.31#10248
"Whenever you cast an instant or sorcery spell from your hand, you may copy that spell. You may choose new targets for the copy."
Show of Confidence 88%
$0.19#10015
"When you cast this spell, copy it for each other instant and sorcery spell you've cast this turn. You may choose new targets for the copies."
Baral and Kari Zev 88%
$0.24#6953
"Whenever you cast your first instant or sorcery spell each turn, you may cast a spell with lesser mana value that shares a card type with it from your hand without paying its mana cost. If you don't, create First Mate Ragavan, a legendary 2/1 red Monkey Pirate creature token. It gains haste until end of turn."
Veyran, Voice of Duality 88%
$1.36#790
"If you casting or copying an instant or sorcery spell causes a triggered ability of a permanent you control to trigger, that ability triggers an additional time."
Complete the Circuit 87%
$0.35#9059
"When you next cast an instant or sorcery spell this turn, copy that spell twice. You may choose new targets for the copies."
+1 more matching line
Hive Mind 86%
$9.85#7651
"Whenever a player casts an instant or sorcery spell, each other player copies that spell. Each of those players may choose new targets for their copy."