Neoform 
Sorcery
$1.05 #2347 0.64 7.5 years
As an additional cost to cast this spell, sacrifice a creature.
Search your library for a creature card with mana value equal to 1 plus the sacrificed creature's mana value, put that card onto the battlefield with an additional +1/+1 counter on it, then shuffle.
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Cards similar to Neoform 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.
Eldritch Evolution94%
$3.61↑#764↑0.6310.2 years↑
"Search your library for a creature card with mana value X or less, where X is 2 plus the sacrificed creature's mana value. Put that card onto the battlefield, then shuffle. Exile this card."
+1 more matching line
Prime Speaker Vannifar94%
$8.68↑#7255↓0.44↓7.7 years
"
, Sacrifice another creature: Search your library for a creature card with mana value equal to 1 plus the sacrificed creature's mana value, put that card onto the battlefield, then shuffle. Activate only as a sorcery."
, Sacrifice another creature: Search your library for a creature card with mana value equal to 1 plus the sacrificed creature's mana value, put that card onto the battlefield, then shuffle. Activate only as a sorcery."
Vivien on the Hunt90%
$0.55↓#8529↓0.93↑4.5 years↓
"+2: You may sacrifice a creature. If you do, search your library for a creature card with mana value equal to 1 plus the sacrificed creature's mana value, put it onto the battlefield, then shuffle."
Birthing Pod89%
$12.10↑#20641.06↑15.4 years↑
"
, , Sacrifice a creature: Search your library for a creature card with mana value equal to 1 plus the sacrificed creature's mana value, put that card onto the battlefield, then shuffle. Activate only as a sorcery."
, , Sacrifice a creature: Search your library for a creature card with mana value equal to 1 plus the sacrificed creature's mana value, put that card onto the battlefield, then shuffle. Activate only as a sorcery."
Fiend Artisan88%
$4.65↑#4469↓0.22↓6.5 years
"
, , Sacrifice another creature: Search your library for a creature card with mana value X or less, put it onto the battlefield, then shuffle. Activate only as a sorcery."
, , Sacrifice another creature: Search your library for a creature card with mana value X or less, put it onto the battlefield, then shuffle. Activate only as a sorcery."
Enigmatic Incarnation87%
$0.12↓#22276↓0.00↓6.7 years
"At the beginning of your end step, you may sacrifice another enchantment. If you do, search your library for a creature card with mana value equal to 1 plus the sacrificed enchantment's mana value, put that card onto the battlefield, then shuffle."
Pyre of Heroes86%
$1.85↑#4656↓0.22↓5.7 years↓
"
, , Sacrifice a creature: Search your library for a creature card that shares a creature type with the sacrificed creature and has mana value equal to 1 plus that creature's mana value. Put that card onto the battlefield, then shuffle. Activate only as a sorcery."
, , Sacrifice a creature: Search your library for a creature card that shares a creature type with the sacrificed creature and has mana value equal to 1 plus that creature's mana value. Put that card onto the battlefield, then shuffle. Activate only as a sorcery."
The Hunger Tide Rises86%
$0.25↓#9160↓0.17↓2.3 years↓
"Sacrifice any number of creatures. Search your library and/or graveyard for a creature card with mana value less than or equal to the number of creatures sacrificed this way and put it onto the battlefield. If you search your library this way, shuffle."
Repurposing Bay84%
$0.51↓#3700↓0.41↓1.7 years↓
", , Sacrifice another artifact: Search your library for an artifact card with mana value equal to 1 plus the sacrificed artifact's mana value, put that card onto the battlefield, then shuffle. Activate only as a sorcery."
, , Sacrifice another artifact: Search your library for an artifact card with mana value equal to 1 plus the sacrificed artifact's mana value, put that card onto the battlefield, then shuffle. Activate only as a sorcery."
Reshape84%
$3.70↑#3146↓0.6322.7 years↑
"Search your library for an artifact card with mana value X or less, put it onto the battlefield, then shuffle."
+1 more matching line
Oswald Fiddlebender81%
$2.21↑#2942↓0.51↓5.2 years↓
"
, , Sacrifice an artifact: Search your library for an artifact card with mana value equal to 1 plus the sacrificed artifact's mana value, put it onto the battlefield, then shuffle. Activate only as a sorcery."
, , Sacrifice an artifact: Search your library for an artifact card with mana value equal to 1 plus the sacrificed artifact's mana value, put it onto the battlefield, then shuffle. Activate only as a sorcery."
Demon of Catastrophes80%
$0.30↓#15401↓0.05↓8.3 years
"As an additional cost to cast this spell, sacrifice a creature."
Chord of Calling80%
$6.14↑#519↑0.6021.0 years↑
"Search your library for a creature card with mana value X or less, put it onto the battlefield, then shuffle."
Nature's Rhythm79%
$3.31↑#852↑0.551.5 years↓
"Search your library for a creature card with mana value X or less, put it onto the battlefield, then shuffle."
Rocco, Cabaretti Caterer78%
$0.20↓#6072↓0.654.5 years↓
"When this card enters, if you cast it, you may search your library for a creature card with mana value X or less, put it onto the battlefield, then shuffle."
Protean Hulk78%
$6.04↑#25711.39↑20.5 years↑
"When this creature dies, search your library for any number of creature cards with total mana value 6 or less, put them onto the battlefield, then shuffle."
Bone Splinters78%
$0.07↓#6031↓0.11↓18.0 years↑
"As an additional cost to cast this spell, sacrifice a creature."
Yisan, the Wanderer Bard78%
$0.36↓#8170↓0.6912.3 years↑
", , Put a verse counter on this card: Search your library for a creature card with mana value equal to the number of verse counters on this card, put it onto the battlefield, then shuffle."
, , Put a verse counter on this card: Search your library for a creature card with mana value equal to the number of verse counters on this card, put it onto the battlefield, then shuffle."
Corrupted Conviction78%
$0.35↓#601↑0.09↓3.5 years↓
"As an additional cost to cast this spell, sacrifice a creature."
Tendrils of Despair78%
$0.15↓#27051↓0.6729.4 years↑
"As an additional cost to cast this spell, sacrifice a creature."