Mystic Genesis 
Instant
$0.17 #18587 0.00 13.6 years
Counter target spell. Create an X/X green Ooze creature token, where X is that spell's mana value.
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Cards similar to Mystic Genesis 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.
Access Denied90%
$2.60↑#3704↑0.34↑4.5 years↓
"Counter target spell. Create X 1/1 colorless Thopter artifact creature tokens with flying, where X is that spell's mana value."
Spell Swindle90%
$1.49↑#3178↑0.43↑8.9 years↓
"Counter target spell. Create X Treasure tokens, where X is that spell's mana value."
Disdainful Stroke90%
$0.13↓#2368↑0.24↑11.9 years↓
"Counter target spell with mana value 4 or greater."
Electrosiphon88%
$0.31↑#5699↑0.27↑2.5 years↓
"Counter target spell. You get an amount of 
equal to its mana value."
equal to its mana value."
Reinterpret86%
$0.43↑#9710↑0.87↑5.4 years↓
"Counter target spell. You may cast a spell with equal or lesser mana value from your hand without paying its mana cost."
Mana Drain83%
$54.91↑#117↑1.89↑32.3 years↑
"Counter target spell. At the beginning of your next main phase, add an amount of 
equal to that spell's mana value."
equal to that spell's mana value."
Overwhelming Intellect82%
$0.22↑#177870.76↑21.3 years↑
"Counter target creature spell. Draw cards equal to that spell's mana value."
Plasm Capture82%
$0.26↑#6630↑0.0513.3 years
"Counter target spell. At the beginning of your next first main phase, add X mana in any combination of colors, where X is that spell's mana value."
Draining Whelk82%
$0.39↑#13168↑0.14↑19.9 years↑
"When this creature enters, counter target spell. Put X +1/+1 counters on this creature, where X is that spell's mana value."
Aura Mutation82%
$0.74↑#2715↑0.21↑25.9 years↑
"Destroy target enchantment. Create X 1/1 green Saproling creature tokens, where X is that enchantment's mana value."
Spell Snare81%
$0.42↑#8442↑0.39↑20.3 years↑
"Counter target spell with mana value 2."
Minor Misstep80%
$0.17#14720↑1.00↑3.6 years↓
"Counter target spell with mana value 1 or less."
Thoughtbind80%
$0.05↓#29397↓0.33↑21.9 years↑
"Counter target spell with mana value 4 or less."
Aether Mutation78%
$0.21↑#196490.0025.3 years↑
"Return target creature to its owner's hand. Create X 1/1 green Saproling creature tokens, where X is that creature's mana value."
Death Mutation76%
$0.22↑#198750.24↑25.3 years↑
"Destroy target nonblack creature. It can't be regenerated. Create X 1/1 green Saproling creature tokens, where X is that creature's mana value."
Cancel75%
$0.06↓#2057↑0.29↑19.9 years↑
"Counter target spell."
Artifact Mutation75%
$1.92↑#2509↑0.17↑25.9 years↑
"Destroy target artifact. It can't be regenerated. Create X 1/1 green Saproling creature tokens, where X is that artifact's mana value."
Dispersal Shield74%
$0.13↓#170960.81↑23.3 years↑
"Counter target spell if its mana value is less than or equal to the greatest mana value among permanents you control."
Rethink73%
$0.10↓#23000↓0.38↑26.3 years↑
"Counter target spell unless its controller pays 
, where X is its mana value."
, where X is its mana value."
Induce Paranoia72%
$0.25↑#213610.47↑20.9 years↑
"Counter target spell. If 
was spent to cast this spell, that spell's controller mills X cards, where X is the spell's mana value."
was spent to cast this spell, that spell's controller mills X cards, where X is the spell's mana value."