Sentinel Tower 
Artifact
$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.
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Cards similar to Sentinel Tower 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.
Aria of Flame84%
$0.54↓#81830.457.2 years↓
"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."
Sphinx-Bone Wand81%
$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."
Pink Horror78%
$0.84↓#104350.27↓3.9 years↓
"Whenever you cast an instant or sorcery spell, this creature deals 2 damage to any target."
Smoldering Egg // Ashmouth Dragon76%
$0.35↓#104540.394.9 years↓
"Whenever you cast an instant or sorcery spell, this creature deals 2 damage to any target."
Weaver of Lightning76%
$0.09↓#20557↓0.07↓10.1 years↑
"Whenever you cast an instant or sorcery spell, this creature deals 1 damage to target creature an opponent controls."
Rockslide Sorcerer74%
$0.14↓#12291↓0.73↑5.9 years↓
"Whenever you cast an instant, sorcery, or Wizard spell, this creature deals 1 damage to any target."
Sorcerer Class74%
$2.50↓#3775↑0.19↓5.1 years↓
"Whenever you cast an instant or sorcery spell, that spell deals damage to each opponent equal to the number of instant and sorcery spells you've cast this turn."
Thousand-Year Storm72%
$1.08↓#1409↑0.64↑7.9 years
"Whenever you cast an instant or sorcery spell, copy it for each other instant and sorcery spell you've cast before it this turn. You may choose new targets for the copies."
Tor Wauki the Younger72%
$0.35↓#6214↑0.30↓4.0 years↓
"Whenever you cast an instant or sorcery spell, Tor Wauki deals 2 damage to any target."
Satyr Firedancer70%
$0.29↓#16341↓0.62↑12.6 years↑
"Whenever an instant or sorcery spell you control deals damage to an opponent, this creature deals that much damage to target creature that player controls."
Niv-Mizzet, Parun70%
$0.75↓#778↑1.27↑7.9 years
"Whenever you draw a card, this card deals 1 damage to any target."
Wild Defiance70%
$0.68↓#117710.33↓14.3 years↑
"Whenever a creature you control becomes the target of an instant or sorcery spell, that creature gets +3/+3 until end of turn."
Show of Confidence70%
$0.18↓#102110.07↓5.4 years↓
"When you cast this spell, copy it for each other instant and sorcery spell you've cast this turn. You may choose new targets for the copies."