Gauntlet of Might 
Artifact
$582.49 #12361 0.86 33.1 years
Red creatures get +1/+1.
Whenever a Mountain is tapped for mana, its controller adds an additional 
.
.Click a line or tag to filter
Cards similar to Gauntlet of Might 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 Bloom90%
$4.17↓#107480.31↓27.9 years↓
"Whenever a Forest is tapped for mana, its controller adds an additional 
."
."
Mirari's Wake90%
$5.74↓#697↑0.66↓24.3 years↓
"Whenever you tap a land for mana, add one mana of any type that land produced."
+1 more matching line
Zhur-Taa Ancient88%
$0.40↓#8250↑0.12↓13.3 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↑0.12↓12.3 years↓
"Whenever a player taps a land for mana, that player adds one mana of any type that land produced."
Paragon of Fierce Defiance86%
$0.20↓#15534↓0.27↓12.1 years↓
"Other red creatures you control get +1/+1."
Wolfwillow Haven86%
$0.24↓#4907↑0.14↓6.6 years↓
"Whenever enchanted land is tapped for mana, its controller adds an additional ."
."
Market Festival86%
$0.17↓#104680.46↓12.3 years↓
"Whenever enchanted land is tapped for mana, its controller adds an additional two mana in any combination of colors."
Dawn's Reflection86%
$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."
Overgrowth86%
$0.24↓#3075↑0.22↓28.5 years↓
"Whenever enchanted land is tapped for mana, its controller adds an additional ."
."
Boartusk Liege85%
$0.56↓#147920.27↓18.3 years↓
"Other red creatures you control get +1/+1."
Keeper of Progenitus85%
$1.84↓#140420.29↓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."
Gauntlet of Power85%
$3.22↓#2556↑0.43↓19.9 years↓
"Whenever a basic land is tapped for mana of the chosen color, its controller adds an additional one mana of that color."
+1 more matching line
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."
Wild Growth84%
$0.35↓#212↑0.16↓33.1 years
"Whenever enchanted land is tapped for mana, its controller adds an additional ."
."
Verdant Haven84%
$0.05↓#125470.00↓13.6 years↓
"Whenever enchanted land is tapped for mana, its controller adds an additional one mana of any color."
Fertile Ground82%
$0.27↓#1065↑0.15↓27.9 years↓
"Whenever enchanted land is tapped for mana, its controller adds an additional one mana of any color."
Ashenmoor Liege81%
$0.40↓#16306↓0.73↓18.3 years↓
"Other red creatures you control get +1/+1."
Blighted Burgeoning81%
$0.14↓#128180.00↓3.4 years↓
"Whenever enchanted land is tapped for mana, its controller adds an additional one mana of any color."
Overabundance80%
$5.52↓#99900.44↓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."