Nikya of the Old Ways 


Legendary Creature — Centaur Druid
You can't cast noncreature spells.
Whenever you tap a land for mana, add one mana of any type that land produced.
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Cards that do something similar 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.
Vorinclex, Voice of Hunger 100%
$13.79#1783
"Whenever you tap a land for mana, add one mana of any type that land produced."
Zendikar Resurgent 100%
$2.55#2259
"Whenever you tap a land for mana, add one mana of any type that land produced."
Mirari's Wake 100%
$6.72#680
"Whenever you tap a land for mana, add one mana of any type that land produced."
Regal Behemoth 95%
$0.37#2376
"Whenever you tap a land for mana while you're the monarch, add an additional one mana of any color."
Molten Exhale 89%
$0.15#13599
"You may cast this spell as though it had flash if you behold a Dragon as an additional cost to cast it."
Savage Firecat 89%
$0.33#30380
"Whenever you tap a land for mana, remove a +1/+1 counter from this creature."
Forbidden Orchard 87%
$9.63#702
"Whenever you tap this land for mana, target opponent creates a 1/1 colorless Spirit creature token."
Hewed Stone Retainers 87%
$0.07#29260
"Cast this spell only if you've cast another spell this turn."
Overabundance 87%
$5.45#9965
"Whenever a player taps a land for mana, that player adds one mana of any type that land produced, and this enchantment deals 1 damage to the player."
Yawgmoth's Agenda 87%
$0.58#26435
"You can't cast more than one spell each turn."
+1 more matching line
Once Upon a Time 87%
$1.45#8818
"If this spell is the first spell you've cast this game, you may cast it without paying its mana cost."