Kefnet's Monument 
Legendary Artifact
$0.45 #5109 0.34 9.4 years
Blue creature spells you cast cost 
less to cast.
less to cast.Whenever you cast a creature spell, target creature an opponent controls doesn't untap during its controller's next untap step.
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Cards similar to Kefnet's Monument 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.
Sapphire Medallion86%
$7.39↑#365↑0.3028.9 years↑
"Blue spells you cast cost less to cast."
less to cast."
Planar Gate85%
$77.60↑#21320↓0.68↑32.3 years↑
"Creature spells you cast cost 
less to cast."
less to cast."
Wavecrash Triton80%
$0.13↓#26426↓0.18↓12.9 years↑
"Whenever you cast a spell that targets this creature, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step."
Honest Rutstein80%
$0.39↓#1787↑0.19↓2.4 years↓
"Creature spells you cast cost less to cast."
less to cast."
Grand Arbiter Augustin IV78%
$17.01↑#1794↑2.58↑20.3 years↑
"Blue spells you cast cost less to cast."
less to cast."
The Water Crystal78%
$3.23↑#1589↑0.61↑1.2 years↓
"Blue spells you cast cost less to cast."
less to cast."
Oketra's Monument78%
$3.10↑#1033↑0.20↓9.4 years
"White creature spells you cast cost less to cast."
less to cast."+1 more matching line
Rhonas's Monument78%
$1.29↑#2145↑0.16↓9.4 years
"Green creature spells you cast cost less to cast."
less to cast."+1 more matching line
Heartless Summoning77%
$1.42↑#2793↑0.2514.9 years↑
"Creature spells you cast cost less to cast."
less to cast."
Marauding Raptor76%
$0.91↑#3000↑0.18↓7.2 years↓
"Creature spells you cast cost less to cast."
less to cast."
Quiet Contemplation76%
$0.21↓#18701↓0.88↑11.9 years↑
"Whenever you cast a noncreature spell, you may pay . If you do, tap target creature an opponent controls and it doesn't untap during its controller's next untap step."
. If you do, tap target creature an opponent controls and it doesn't untap during its controller's next untap step."
Sunscape Familiar76%
$1.24↑#61270.14↓25.6 years↑
"Green spells and blue spells you cast cost less to cast."
less to cast."
Nightscape Familiar76%
$0.40↓#1152↑0.16↓25.6 years↑
"Blue spells and red spells you cast cost less to cast."
less to cast."
Bontu's Monument76%
$4.11↑#676↑0.259.4 years
"Black creature spells you cast cost less to cast."
less to cast."+1 more matching line
Warden of Evos Isle76%
$0.18↓#3851↑0.13↓13.1 years↑
"Creature spells with flying you cast cost less to cast."
less to cast."
The Sibsig Ceremony75%
$0.31↓#9773↓0.311.4 years↓
"Creature spells you cast cost less to cast."
less to cast."
Hazoret's Monument75%
$1.48↑#1913↑0.13↓9.4 years
"Red creature spells you cast cost less to cast."
less to cast."
Misstep74%
$0.18↓#26613↓0.21↓26.9 years↑
"Creatures target player controls don't untap during that player's next untap step."
Defiler of Dreams74%
$0.39↓#47330.274.0 years↓
"As an additional cost to cast blue permanent spells, you may pay 2 life. Those spells cost 
less to cast if you paid life this way. This effect reduces only the amount of blue mana you pay."
less to cast if you paid life this way. This effect reduces only the amount of blue mana you pay."
Herald's Horn74%
$1.97↑#150↑0.21↓9.0 years
"Creature spells you cast of the chosen type cost less to cast."
less to cast."