Klauth, Unrivaled Ancient 
Legendary Creature — Dragon
$9.98 #2178 0.66 5.1 years
Flying, haste
Whenever Klauth attacks, add X mana in any combination of colors, where X is the total power of attacking creatures. Spend this mana only to cast spells. Until end of turn, you don't lose this mana as steps and phases end.
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Cards similar to Klauth, Unrivaled Ancient 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.
Savage Ventmaw82%
$0.31↓#1665↑0.37↓11.4 years↑
"Whenever this creature attacks, add . Until end of turn, you don't lose this mana as steps and phases end."
. Until end of turn, you don't lose this mana as steps and phases end."
Grand Warlord Radha80%
$0.84↓#5545↓0.23↓8.4 years↑
"Whenever one or more creatures you control attack, add that much mana in any combination of and/or . Until end of turn, you don't lose this mana as steps and phases end."
and/or . Until end of turn, you don't lose this mana as steps and phases end."
Tanuki Transplanter79%
$1.24↓#6427↓0.83↑4.5 years
"Whenever this creature or equipped creature attacks, add an amount of equal to its power. Until end of turn, you don't lose this mana as steps and phases end."
equal to its power. Until end of turn, you don't lose this mana as steps and phases end."
Brazen Collector77%
$0.25↓#10176↓0.29↓2.1 years↓
"Whenever this creature attacks, add . Until end of turn, you don't lose this mana as steps and phases end."
. Until end of turn, you don't lose this mana as steps and phases end."
Radha, Heir to Keld77%
$0.18↓#6388↓0.6019.6 years↑
"Whenever this card attacks, you may add ."
."
Iron Man, Titan of Innovation75%
$11.40↑#5881↓1.14↑1.8 years↓
"Flying, haste"
Colossal Plow74%
$0.24↓#8737↓0.00↓5.6 years
"Whenever this Vehicle attacks, add 
and you gain 3 life. Until end of turn, you don't lose this mana as steps and phases end."
and you gain 3 life. Until end of turn, you don't lose this mana as steps and phases end."
Conduit of Storms // Conduit of Emrakul72%
$0.12↓#17644↓0.25↓10.1 years↑
"Whenever this creature attacks, add 
at the beginning of your next main phase this turn."
at the beginning of your next main phase this turn."
Firkraag, Cunning Instigator72%
$1.09↓#5947↓0.39↓4.2 years
"Flying, haste"
Inferno of the Star Mounts71%
$2.78↓#6268↓0.29↓5.1 years
"Flying, haste"
Fire Lord Ozai70%
$1.02↓#10036↓0.00↓0.8 years↓
"Whenever this card attacks, you may sacrifice another creature. If you do, add an amount of equal to the sacrificed creature's power. Until end of combat, you don't lose this mana as steps end."
equal to the sacrificed creature's power. Until end of combat, you don't lose this mana as steps end."
Tesak, Judith's Hellhound70%
$0.32↓#12324↓0.31↓2.6 years↓
"Whenever this card attacks, add for each attacking creature."
for each attacking creature."
Summon: Esper Valigarmanda70%
$0.24↓#5316↓0.27↓1.2 years↓
"Flying, haste"
The Lord of the Eagles70%
$0.39↓#17047↓0.00↓0.1 years↓
"Flying"