Winter's Night 
World Enchantment
$0.84 #30098 0.06 30.4 years
Whenever a player taps a snow land for mana, that player adds one mana of any type that land produced. That land doesn't untap during its controller's next untap step.
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Cards similar to Winter's Night 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 Hunger91%
$4.74↑#1766↑2.55↑15.4 years↓
"Whenever an opponent taps a land for mana, that land doesn't untap during its controller's next untap step."
Zhur-Taa Ancient88%
$0.33↓#8336↑0.0013.5 years↓
"Whenever a player taps a land for mana, that player adds one mana of any type that land produced."
Dictate of Karametra81%
$0.79↓#6270↑0.1212.5 years↓
"Whenever a player taps a land for mana, that player adds one mana of any type that land produced."
Overabundance80%
$5.67↑#10117↑0.59↑26.0 years↓
"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."
Nikya of the Old Ways80%
$0.33↓#10750↑0.24↑7.7 years↓
"Whenever you tap a land for mana, add one mana of any type that land produced."
Mana Flare80%
$0.53↓#3340↑0.36↑33.2 years↑
"Whenever a player taps a land for mana, that player adds one mana of any type that land produced."
Heartbeat of Spring80%
$2.32↑#4288↑0.39↑22.1 years↓
"Whenever a player taps a land for mana, that player adds one mana of any type that land produced."
Lavaleaper77%
$0.30↓#7103↑0.25↑0.7 years↓
"Whenever a player taps a basic land for mana, that player adds one mana of any type that land produced."
Vernal Bloom76%
$4.27↑#10957↑0.35↑28.0 years↓
"Whenever a Forest is tapped for mana, its controller adds an additional ."
."
Mirari's Wake76%
$3.05↑#713↑0.67↑24.4 years↓
"Whenever you tap a land for mana, add one mana of any type that land produced."
Extraplanar Lens76%
$12.94↑#1695↑0.18↑23.0 years↓
"Whenever a land with the same name as the exiled card is tapped for mana, its controller adds one mana of any type that land produced."
Gauntlet of Might76%
$600.00↑#12421↑0.18↑33.2 years↑
"Whenever a Mountain is tapped for mana, its controller adds an additional ."
."
Groundchuck & Dirtbag76%
$0.41↓#8597↑0.38↑0.6 years↓
"Whenever you tap a land for mana, add ."
."
Wolfwillow Haven76%
$0.18↓#4995↑0.006.7 years↓
"Whenever enchanted land is tapped for mana, its controller adds an additional ."
."
Market Festival76%
$0.22↓#10638↑0.33↑12.5 years↓
"Whenever enchanted land is tapped for mana, its controller adds an additional two mana in any combination of colors."
Dawn's Reflection76%
$0.20↓#9146↑0.33↑22.4 years↓
"Whenever enchanted land is tapped for mana, its controller adds an additional two mana in any combination of colors."
Overgrowth75%
$0.25↓#3164↑0.0428.6 years↓
"Whenever enchanted land is tapped for mana, its controller adds an additional ."
."
Wild Growth75%
$0.40↓#216↑0.16↑33.2 years↑
"Whenever enchanted land is tapped for mana, its controller adds an additional ."
."
Snowfall75%
$0.22↓#266360.29↑31.4 years↑
"Whenever an Island is tapped for mana, its controller may add an additional 
. If that Island is snow, its controller may add an additional instead. Spend this mana only to pay cumulative upkeep costs."
. If that Island is snow, its controller may add an additional instead. Spend this mana only to pay cumulative upkeep costs."
Keeper of Progenitus74%
$2.10↑#14251↑0.31↑18.0 years↓
"Whenever a player taps a Mountain, Forest, or Plains for mana, that player adds one mana of any type that land produced."