Tangleroot 
Artifact
$0.68 #17215 0.00 22.9 years
Whenever a player casts a creature spell, that player adds 
.
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Cards similar to Tangleroot 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.
Magus of the Vineyard80%
$4.47↑#7361↑0.54↑19.3 years↓
"At the beginning of each player's first main phase, that player adds ."
."
Eladamri's Vineyard78%
$2.32↑#7856↑0.35↑28.9 years↑
"At the beginning of each player's first main phase, that player adds ."
."
Shizuko, Caller of Autumn76%
$4.19↑#13769↑1.00↑21.6 years↓
"At the beginning of each player's upkeep, that player adds . Until end of turn, they don't lose this mana as steps and phases end."
. Until end of turn, they don't lose this mana as steps and phases end."
Rodeo Pyromancers74%
$0.25↓#6150↑0.27↑2.4 years↓
"Whenever you cast your first spell each turn, add 
."
."
Heartbeat of Spring70%
$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 Flare70%
$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."