High Tide 
Instant
$0.88 #798 0.57 32.0 years
Until end of turn, whenever a player taps an Island for mana, that player adds an additional
.
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Cards similar to High Tide 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.
Bubbling Muck92%
$2.75↑#2210↓0.45↓27.4 years↓
"Until end of turn, whenever a player taps a Swamp for mana, that player adds an additional
."
Pyre Rhymer // Molten Tide82%
$0.33↓#16795↓0.18↓0.0 years↓
"Until end of turn, whenever you tap a Mountain for mana, add an additional
."
Zhur-Taa Ancient80%
$0.33↓#8336↓0.00↓13.5 years↓
"Whenever a player taps a land for mana, that player adds one mana of any type that land produced."
Dictate of Karametra74%
$0.79↓#6270↓0.12↓12.5 years↓
"Whenever a player taps a land for mana, that player adds one mana of any type that land produced."
Nikya of the Old Ways74%
$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 Flare72%
$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 Spring72%
$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."
Snowfall72%
$0.22↓#26636↓0.29↓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."
Overabundance72%
$5.67↑#10117↓0.5926.0 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."
Gauntlet of Might71%
$600.00↑#12421↓0.18↓33.2 years↑
"Whenever a Mountain is tapped for mana, its controller adds an additional
."
Vernal Bloom71%
$4.27↑#10957↓0.35↓28.0 years↓
"Whenever a Forest is tapped for mana, its controller adds an additional
."
Winter's Night70%
$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."
Mirari's Wake70%
$3.05↑#7130.67↑24.4 years↓
"Whenever you tap a land for mana, add one mana of any type that land produced."