Geistflame Reservoir 

Artifact
$0.18 #17357 0.00 4.9 years
Whenever you cast an instant or sorcery spell, put a charge counter on this artifact.
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Cards similar to Geistflame Reservoir 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.
Firemind's Research95%
$0.35↑#13379↑0.29↑7.9 years↑
"Whenever you cast an instant or sorcery spell, put a charge counter on this enchantment."
+1 more matching line
Relic Amulet88%
$0.17↓#195270.47↑5.9 years
"
,
, Remove all charge counters from this artifact: It deals that much damage to target creature."
+1 more matching line
Elkin Bottle88%
$0.34↑#30443↓0.0031.3 years↑
"
,
: Exile the top card of your library. Until the beginning of your next upkeep, you may play that card."
Talon of Pain86%
$0.12↓#21887↓0.22↑22.6 years↑
"
,
, Remove X charge counters from this artifact: It deals X damage to any target."
Chandra, Fire Artisan84%
$0.36↑#10556↑0.14↑7.3 years↑
"+1: Exile the top card of your library. You may play it this turn."
Adaptive Training Post84%
$0.26↑#8440↑0.30↑1.4 years↓
"Whenever you cast an instant or sorcery spell, if this artifact has fewer than three charge counters on it, put a charge counter on it."
Sphinx-Bone Wand84%
$0.44↑#151690.32↑16.4 years↑
"Whenever you cast an instant or sorcery spell, you may put a charge counter on this artifact. If you do, this artifact deals damage equal to the number of charge counters on it to any target."
Weather Maker84%
$0.51↑#9971↑0.000.5 years↓
"
, Remove three charge counters from this artifact: It deals 3 damage to any target."
Chandra, Pyromaster82%
$0.46↑#13002↑0.12↑13.1 years↑
"0: Exile the top card of your library. You may play it this turn."
Oracle's Vault82%
$0.30↑#13050↑0.33↑9.4 years↑
"
,
: Exile the top card of your library. Until end of turn, you may play that card. Put a brick counter on this artifact."
Gelectrode82%
$0.53↑#9047↑0.0520.6 years↑
"
: This creature deals 1 damage to any target."
+1 more matching line
Diary of Dreams82%
$0.30↑#10367↑0.000.4 years↓
"Whenever you cast an instant or sorcery spell, put a page counter on this artifact."
Syr Carah, the Bold82%
$0.22↑#142440.60↑6.9 years↑
"
: this card deals 1 damage to any target."
+1 more matching line
Aerial Caravan81%
$0.40↑#29665↓0.0726.9 years↑
"

: Exile the top card of your library. Until end of turn, you may play that card."
Magmatic Channeler80%
$0.25↑#142360.12↑5.9 years
"
, Discard a card: Exile the top two cards of your library, then choose one of them. You may play that card this turn."
Dynavolt Tower80%
$0.32↑#159660.53↑9.9 years↑
"
, Pay 



: This artifact deals 3 damage to any target."
+1 more matching line
Fire Nation Turret80%
$8.10↑#6374↑0.000.8 years↓
"Remove fifty charge counters from this artifact: It deals 50 damage to any target."
Unstable Amulet80%
$0.26↑#4195↑0.10↑2.2 years↓
"
, Pay 
: Exile the top card of your library. You may play it until you exile another card with this artifact."
Count on Luck80%
$0.46↑#4287↑0.21↑1.6 years↓
"At the beginning of your upkeep, exile the top card of your library. You may play that card this turn."