Snowfall 

Enchantment
$0.21 #26394 0.36 31.3 years
Cumulative upkeep
(At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it.)
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.
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Cards similar to Snowfall 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.
Vernal Bloom76%
$4.17↑#10748↑0.3127.9 years↓
"Whenever a Forest is tapped for mana, its controller adds an additional
."
Wolfwillow Haven76%
$0.24↑#4907↑0.14↓6.6 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↑0.22↓22.3 years↓
"Whenever enchanted land is tapped for mana, its controller adds an additional two mana in any combination of colors."
Overgrowth76%
$0.24↑#3075↑0.22↓28.5 years↓
"Whenever enchanted land is tapped for mana, its controller adds an additional 
."
Winter's Night75%
$0.87↑#296740.15↓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."
Wild Growth75%
$0.35↑#212↑0.16↓33.1 years↑
"Whenever enchanted land is tapped for mana, its controller adds an additional
."
Nikya of the Old Ways75%
$0.37↑#10535↑0.50↑7.6 years↓
"Whenever you tap a land for mana, add one mana of any type that land produced."