Winter's Night 
World Enchantment
$0.87 #29674 0.15 30.2 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%
$4.93↑#1758↑2.61↑15.3 years↓
"Whenever an opponent taps a land for mana, that land doesn't untap during its controller's next untap step."
Zhur-Taa Ancient88%
$0.40↓#8250↑0.1213.3 years↓
"Whenever a player taps a land for mana, that player adds one mana of any type that land produced."
Dictate of Karametra88%
$0.88↑#6154↑0.1212.3 years↓
"Whenever a player taps a land for mana, that player adds one mana of any type that land produced."
Heartbeat of Spring84%
$2.22↑#4250↑0.54↑21.9 years↓
"Whenever a player taps a land for mana, that player adds one mana of any type that land produced."
Mana Flare84%
$0.47↓#3297↑0.58↑33.1 years↑
"Whenever a player taps a land for mana, that player adds one mana of any type that land produced."
Overabundance80%
$5.52↑#9990↑0.44↑25.9 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%
$0.37↓#10535↑0.50↑7.6 years↓
"Whenever you tap a land for mana, add one mana of any type that land produced."
Vernal Bloom80%
$4.17↑#10748↑0.31↑27.9 years↓
"Whenever a Forest is tapped for mana, its controller adds an additional ."
."
Lavaleaper78%
$0.31↓#7518↑0.00↓0.6 years↓
"Whenever a player taps a basic land for mana, that player adds one mana of any type that land produced."
Keeper of Progenitus76%
$1.84↑#14042↑0.29↑17.9 years↓
"Whenever a player taps a Mountain, Forest, or Plains for mana, that player adds one mana of any type that land produced."
Zendikar Resurgent76%
$2.41↑#2336↑0.47↑10.6 years↓
"Whenever you tap a land for mana, add one mana of any type that land produced."
Mirari's Wake76%
$5.74↑#697↑0.66↑24.3 years↓
"Whenever you tap a land for mana, add one mana of any type that land produced."
Gauntlet of Might76%
$582.49↑#12361↑0.86↑33.1 years↑
"Whenever a Mountain is tapped for mana, its controller adds an additional ."
."
Groundchuck & Dirtbag76%
$0.41↓#9259↑0.00↓0.5 years↓
"Whenever you tap a land for mana, add ."
."
Wolfwillow Haven76%
$0.24↓#4907↑0.146.6 years↓
"Whenever enchanted land is tapped for mana, its controller adds an additional ."
."
Market Festival76%
$0.17↓#10468↑0.46↑12.3 years↓
"Whenever enchanted land is tapped for mana, its controller adds an additional two mana in any combination of colors."
Dawn's Reflection76%
$0.22↓#8972↑0.2222.3 years↓
"Whenever enchanted land is tapped for mana, its controller adds an additional two mana in any combination of colors."
Overgrowth75%
$0.24↓#3075↑0.2228.5 years↓
"Whenever enchanted land is tapped for mana, its controller adds an additional ."
."
Wild Growth75%
$0.35↓#212↑0.1633.1 years↑
"Whenever enchanted land is tapped for mana, its controller adds an additional ."
."
Snowfall75%
$0.21↓#263940.36↑31.3 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."