Oketra's Monument 
Legendary Artifact
$3.10 #1033 0.20 9.4 years
White creature spells you cast cost 
less to cast.
less to cast.Whenever you cast a creature spell, create a 1/1 white Warrior creature token with vigilance.
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Cards similar to Oketra'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.
Pearl Medallion86%
$5.55↑#454↑0.2328.9 years↑
"White spells you cast cost less to cast."
less to cast."
Planar Gate86%
$77.60↑#21320↓0.68↑32.3 years↑
"Creature spells you cast cost 
less to cast."
less to cast."
Rhonas's Monument82%
$1.29↓#2145↓0.169.4 years
"Green creature spells you cast cost less to cast."
less to cast."
God-Eternal Oketra82%
$0.67↓#2438↓0.34↑7.3 years↓
"Whenever you cast a creature spell, create a 4/4 black Zombie Warrior creature token with vigilance."
Honest Rutstein80%
$0.39↓#1787↓0.192.4 years↓
"Creature spells you cast cost less to cast."
less to cast."
The Sibsig Ceremony80%
$0.31↓#9773↓0.31↑1.4 years↓
"Creature spells you cast cost less to cast."
less to cast."+1 more matching line
Grand Arbiter Augustin IV78%
$17.01↑#1794↓2.58↑20.3 years↑
"White spells you cast cost less to cast."
less to cast."
Stormscape Familiar78%
$0.94↓#6811↓0.1425.6 years↑
"White spells and black spells you cast cost less to cast."
less to cast."
Heartless Summoning78%
$1.42↓#2793↓0.2514.9 years↑
"Creature spells you cast cost less to cast."
less to cast."
Kefnet's Monument78%
$0.45↓#5109↓0.34↑9.4 years
"Blue creature spells you cast cost less to cast."
less to cast."+1 more matching line
Thornscape Familiar77%
$0.26↓#17790↓0.07↓25.6 years↑
"Red spells and white spells you cast cost less to cast."
less to cast."
Defiler of Faith76%
$0.36↓#4892↓0.304.0 years↓
"As an additional cost to cast white 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 white mana you pay."
less to cast if you paid life this way. This effect reduces only the amount of white mana you pay."+1 more matching line
Marauding Raptor76%
$0.91↓#3000↓0.187.2 years↓
"Creature spells you cast cost less to cast."
less to cast."
Hazoret's Monument76%
$1.48↓#1913↓0.139.4 years
"Red creature spells you cast cost less to cast."
less to cast."
Xerex Strobe-Knight76%
$0.08↓#14930↓0.00↓3.4 years↓
"
: Create a 2/2 white and blue Knight creature token with vigilance. Activate only if you've cast two or more spells this turn."
: Create a 2/2 white and blue Knight creature token with vigilance. Activate only if you've cast two or more spells this turn."
Warden of Evos Isle76%
$0.18↓#3851↓0.1313.1 years↑
"Creature spells with flying you cast cost less to cast."
less to cast."
The Wind Crystal75%
$6.70↑#10030.35↑1.2 years↓
"White spells you cast cost less to cast."
less to cast."
Vanguard of Brimaz74%
$0.26↓#16137↓0.00↓12.6 years↑
"Whenever you cast a spell that targets this creature, create a 1/1 white Cat Soldier creature token with vigilance."
Herald's Horn74%
$1.97↓#150↑0.219.0 years
"Creature spells you cast of the chosen type cost less to cast."
less to cast."
Watcher of the Spheres74%
$0.50↓#4402↓0.03↓6.2 years↓
"Creature spells with flying you cast cost less to cast."
less to cast."