Sphinx-Bone Wand 
Artifact
$0.44 #15169 0.32 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.
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Cards similar to Sphinx-Bone Wand 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 an instant or sorcery spell, this creature deals 2 damage to any target."
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"Whenever you cast an instant or sorcery spell, this creature deals 2 damage to any target."
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"Whenever you cast an instant or sorcery spell, this creature deals 1 damage to target creature an opponent controls."
Firemind's Research86%
$0.35↓#133790.297.9 years↓
"Whenever you cast an instant or sorcery spell, put a charge counter on this enchantment."
Imminent Doom86%
$0.15↓#25092↓0.319.1 years↓
"Whenever you cast a spell with mana value equal to the number of doom counters on this enchantment, this enchantment deals that much damage to any target. Then put a doom counter on this enchantment."
Rockslide Sorcerer84%
$0.14↓#122910.73↑5.9 years↓
"Whenever you cast an instant, sorcery, or Wizard spell, this creature deals 1 damage to any target."
Geistflame Reservoir84%
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"Whenever you cast an instant or sorcery spell, put a charge counter on this artifact."
Embersmith82%
$0.13↓#29433↓0.11↓15.9 years
"Whenever you cast an artifact spell, you may pay 
. If you do, this creature deals 1 damage to any target."
. If you do, this creature deals 1 damage to any target."
Sentinel Tower81%
$2.60↑#9886↑0.47↑8.2 years↓
"Whenever an instant or sorcery spell is cast during your turn, this artifact deals damage to any target equal to 1 plus the number of instant and sorcery spells cast before that spell this turn."
Gelectrode81%
$0.53↑#9047↑0.05↓20.6 years↑
"
: This creature deals 1 damage to any target."
: This creature deals 1 damage to any target."
Labyrinth Champion80%
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"Whenever you cast a spell that targets this creature, this creature deals 2 damage to any target."
Pyroconvergence80%
$0.11↓#26450↓0.19↓13.9 years↓
"Whenever you cast a multicolored spell, this enchantment deals 2 damage to any target."
Dreamstalker Manticore79%
$0.12↓#26487↓0.416.6 years↓
"Whenever you cast your first spell during each opponent's turn, this creature deals 1 damage to any target."
Aria of Flame79%
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"Whenever you cast an instant or sorcery spell, put a verse counter on this enchantment, then it deals damage equal to the number of verse counters on it to target player or planeswalker."
Pyromancer's Assault79%
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"Whenever you cast your second spell each turn, this enchantment deals 2 damage to any target."
Burning Vengeance79%
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"Whenever you cast a spell from your graveyard, this enchantment deals 2 damage to any target."
Tor Wauki the Younger78%
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"Whenever you cast an instant or sorcery spell, Tor Wauki deals 2 damage to any target."
Ral, Izzet Viceroy78%
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"−8: You get an emblem with "Whenever you cast an instant or sorcery spell, this emblem deals 4 damage to any target and you draw two cards.""
Kamahl, Pit Fighter78%
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": this card deals 3 damage to any target."
: this card deals 3 damage to any target."
Rumbling Aftershocks78%
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"Whenever you cast a kicked spell, you may have this enchantment deal damage to any target equal to the number of times that spell was kicked."