Starfield Mystic 
Creature — Human Cleric
$0.31 #1183 0.19 7.2 years
Enchantment spells you cast cost less to cast.
less to cast.Whenever an enchantment you control is put into a graveyard from the battlefield, put a +1/+1 counter on this creature.
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Cards similar to Starfield Mystic 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.
Herald of the Pantheon96%
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"Enchantment spells you cast cost less to cast."
less to cast."
Jukai Naturalist95%
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"Enchantment spells you cast cost less to cast."
less to cast."
Inquisitive Glimmer94%
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"Enchantment spells you cast cost less to cast."
less to cast."
Savior of the Sleeping90%
$0.08↓#22857↓0.00↓3.0 years↓
"Whenever an enchantment you control is put into a graveyard from the battlefield, put a +1/+1 counter on this creature."
Mana Matrix88%
$74.48↑#23363↓0.38↑32.3 years↑
"Instant and enchantment spells you cast cost 
less to cast."
less to cast."
Vengeful Townsfolk82%
$0.12↓#20367↓0.33↑2.4 years↓
"Whenever one or more other creatures you control die, put a +1/+1 counter on this creature."
Rot Shambler82%
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"Whenever another creature you control dies, put a +1/+1 counter on this creature."
Unruly Mob82%
$0.08↓#17858↓0.00↓14.9 years↑
"Whenever another creature you control dies, put a +1/+1 counter on this creature."
Gavony Unhallowed82%
$0.08↓#19717↓0.87↑10.1 years↑
"Whenever another creature you control dies, put a +1/+1 counter on this creature."
Starnheim Courser80%
$0.21↓#2918↓0.145.6 years↓
"Artifact and enchantment spells you cast cost less to cast."
less to cast."
Algae Gharial80%
$0.13↓#21915↓0.05↓17.9 years↑
"Whenever another creature dies, you may put a +1/+1 counter on this creature."
Rockslide Elemental80%
$0.15↓#23966↓0.47↑17.9 years↑
"Whenever another creature dies, you may put a +1/+1 counter on this creature."
Lumberknot80%
$0.11↓#15284↓0.2514.9 years↑
"Whenever a creature dies, put a +1/+1 counter on this creature."
Guardian Kirin80%
$0.11↓#24342↓0.50↑5.2 years↓
"Whenever another creature you control dies, put a +1/+1 counter on this creature."
Sengir Connoisseur79%
$0.21↓#20360↓0.00↓4.0 years↓
"Whenever one or more other creatures die, put a +1/+1 counter on this creature. This ability triggers only once each turn."
Scavenger Drake79%
$0.18↓#22233↓0.40↑17.9 years↑
"Whenever another creature dies, you may put a +1/+1 counter on this creature."
Swarm of Bloodflies79%
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"Whenever another creature dies, put a +1/+1 counter on this creature."
Hero of Iroas77%
$0.66↑#7118↓0.1712.6 years↑
"Aura spells you cast cost less to cast."
less to cast."+1 more matching line
Thanos, Death's Consort76%
$2.20↑#18354↓0.00↓0.2 years↓
"Whenever another creature dies, put a +1/+1 counter on this card."
Mausoleum Harpy76%
$0.04↓#29123↓0.198.6 years↑
"Whenever another creature you control dies, if you have the city's blessing, put a +1/+1 counter on this creature."