Mystic Genesis 
Instant
$0.16 #18723 0.12 13.7 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%
$2.27↑#3769↑0.36↑4.7 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%
$1.58↑#3255↑0.51↑9.1 years↓
"Counter target spell. Create X Treasure tokens, where X is that spell's mana value."
Disdainful Stroke90%
$0.09↓#2356↑0.34↑12.1 years↓
"Counter target spell with mana value 4 or greater."
Electrosiphon88%
$0.32↑#5812↑0.75↑2.6 years↓
"Counter target spell. You get an amount of 
equal to its mana value."
equal to its mana value."
Reinterpret86%
$0.45↑#9947↑0.33↑5.5 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%
$49.84↑#119↑2.03↑32.4 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%
$0.20↑#180520.31↑21.4 years↑
"Counter target creature spell. Draw cards equal to that spell's mana value."
Plasm Capture82%
$0.26↑#6824↑0.56↑13.5 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%
$0.40↑#13413↑0.44↑20.0 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%
$0.82↑#2785↑0.2126.0 years↑
"Destroy target enchantment. Create X 1/1 green Saproling creature tokens, where X is that enchantment's mana value."
Spell Snare81%
$0.36↑#8395↑0.35↑20.5 years↑
"Counter target spell with mana value 2."
Minor Misstep80%
$0.14↓#14966↑0.40↑3.7 years↓
"Counter target spell with mana value 1 or less."
Thoughtbind80%
$0.11↓#29535↓0.1222.1 years↑
"Counter target spell with mana value 4 or less."
Aether Mutation78%
$0.22↑#200250.1125.4 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%
$0.21↑#200910.0525.4 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%
$0.07↓#2087↑0.31↑20.0 years↑
"Counter target spell."
Artifact Mutation75%
$1.84↑#2589↑0.1926.0 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%
$0.16#172500.43↑23.4 years↑
"Counter target spell if its mana value is less than or equal to the greatest mana value among permanents you control."
Rethink73%
$0.13↓#23354↓0.43↑26.4 years↑
"Counter target spell unless its controller pays 
, where X is its mana value."
, where X is its mana value."
Induce Paranoia72%
$0.24↑#217060.2121.0 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."