Farsight Mask 
Artifact
$0.34 #15535 0.11 23.0 years
Whenever a source an opponent controls deals damage to you, if this artifact is untapped, you may draw a card.
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Cards similar to Farsight Mask 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.
Retaliator Griffin76%
$0.37↑#22528↓0.1217.5 years↓
"Whenever a source an opponent controls deals damage to you, you may put that many +1/+1 counters on this creature."
Well of Discovery75%
$0.41↑#27074↓0.00↓26.4 years↑
"At the beginning of your end step, if you control no untapped lands, draw a card."
Howling Mine74%
$5.26↑#722↑0.32↑33.2 years↑
"At the beginning of each player's draw step, if this artifact is untapped, that player draws an additional card."
Awaken the Sky Tyrant72%
$0.35↑#23653↓0.1010.9 years↓
"When a source an opponent controls deals damage to you, sacrifice this enchantment. If you do, create a 5/5 red Dragon creature token with flying."
Sphinx's Disciple70%
$0.10↓#23549↓0.0612.7 years↓
"Whenever this creature becomes untapped, draw a card."
Thunderstaff70%
$0.26↓#21761↓0.24↑22.7 years
"As long as this artifact is untapped, if a creature would deal combat damage to you, prevent 1 of that damage."
Iymrith, Desert Doom70%
$1.09↑#5525↑0.115.2 years↓
"Whenever this card deals combat damage to a player, draw a card. Then if you have fewer than three cards in hand, draw cards equal to the difference."
Angelheart Vial70%
$0.43↑#177660.00↓16.5 years↓
"Whenever you're dealt damage, you may put that many charge counters on this artifact."