Diamond Mare 
Artifact Creature — Horse
$0.15 #7494 0.29 8.1 years
As this creature enters, choose a color.
Whenever you cast a spell of the chosen color, you gain 1 life.
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Cards similar to Diamond Mare 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.
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"Whenever you cast a spell of the chosen color, put a +1/+1 counter on this creature."
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Jeweled Torque82%
$0.22↑#30264↓0.13↓26.9 years↑
"Whenever a player casts a spell of the chosen color, you may pay . If you do, you gain 2 life."
. If you do, you gain 2 life."+1 more matching line
Gauntlet of Power80%
$3.22↑#2556↑0.43↑19.9 years↑
"As this artifact enters, choose a color."
Throne of Eldraine80%
$28.44↑#878↑0.253.0 years↓
"As this card enters, choose a color."
The Prismatic Piper78%
$0.10↓#28212↓0.47↑5.8 years↓
"If this card is your commander, choose a color before the game begins. this card is the chosen color."
Contemplation78%
$0.24↑#20894↓0.64↑28.5 years↑
"Whenever you cast a spell, you gain 1 life."
Setessan Battle Priest78%
$0.04↓#27041↓0.2012.9 years↑
"Whenever you cast a spell that targets this creature, you gain 2 life."
Paradise Plume78%
$0.20↑#10973↓0.00↓19.9 years↑
"Whenever a player casts a spell of the chosen color, you may gain 1 life."
+1 more matching line
Lifesmith77%
$0.10↓#30093↓0.47↑15.9 years↑
"Whenever you cast an artifact spell, you may pay 
. If you do, you gain 3 life."
. If you do, you gain 3 life."
Student of Ojutai76%
$0.05↓#17672↓0.18↓11.4 years↑
"Whenever you cast a noncreature spell, you gain 2 life."
Treva, the Renewer76%
$0.58↑#21440↓0.06↓25.9 years↑
"Whenever this card deals combat damage to a player, you may pay 
. If you do, choose a color, then you gain 1 life for each permanent of that color."
. If you do, choose a color, then you gain 1 life for each permanent of that color."
Dawnhart Geist75%
$0.17↑#17696↓0.294.8 years↓
"Whenever you cast an enchantment spell, you gain 2 life."
Doomskar Oracle74%
$0.14↓#19343↓0.00↓5.6 years↓
"Whenever you cast your second spell each turn, you gain 2 life."