Chambered Nautilus 
Creature — Nautilus Beast
$0.17 #27255 0.07 26.9 years
Whenever this creature becomes blocked, you may draw a card.
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Cards similar to Chambered Nautilus 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.
Drelnoch98%
$0.10↓#277660.0020.1 years↓
"Whenever this creature becomes blocked, you may draw two cards."
Slith Strider96%
$0.09↓#279790.50↑22.9 years↓
"Whenever this creature becomes blocked, draw a card."
Saprazzan Heir96%
$1.98↑#21450↑0.0026.9 years
"Whenever this creature becomes blocked, you may draw three cards."
Infiltration Lens92%
$2.09↑#3730↑0.17↑15.9 years↓
"Whenever equipped creature becomes blocked by a creature, you may draw two cards."
Psychic Membrane92%
$0.20↑#17329↑0.27↑22.9 years↓
"Whenever this creature blocks, you may draw a card."
Stormsurge Kraken90%
$0.52↑#5945↑0.0011.8 years↓
"As long as you control your commander, this creature gets +2/+2 and has "Whenever this creature becomes blocked, you may draw two cards.""
Sacred Prey86%
$0.20↑#292860.22↑26.9 years
"Whenever this creature becomes blocked, you gain 1 life."
Viashino Weaponsmith84%
$0.15↓#313140.0027.9 years
"Whenever this creature becomes blocked by a creature, this creature gets +2/+2 until end of turn."
Deeproot Warrior83%
$0.09↓#280490.008.9 years↓
"Whenever this creature becomes blocked, it gets +1/+1 until end of turn."
Norwood Warrior83%
$0.58↑#299890.31↑28.2 years↑
"Whenever this creature becomes blocked, it gets +1/+1 until end of turn."
Trained Cheetah83%
$10.95↑#317730.57↑27.3 years
"Whenever this creature becomes blocked, it gets +1/+1 until end of turn."
Deepwood Wolverine83%
$0.23↑#303770.0026.9 years
"Whenever this creature becomes blocked, it gets +2/+0 until end of turn."
Razorclaw Bear83%
$29.81↑#20911↑0.41↑28.2 years↑
"Whenever this creature becomes blocked, it gets +2/+2 until end of turn."
Snorting Gahr83%
$0.15↓#315620.40↑26.9 years
"Whenever this creature becomes blocked, it gets +2/+2 until end of turn."
Slashing Tiger83%
$75.32↑#314300.0027.3 years
"Whenever this creature becomes blocked, it gets +2/+2 until end of turn."
Grazilaxx, Illithid Scholar82%
$1.64↑#1944↑0.34↑5.1 years↓
"Whenever a creature you control becomes blocked, you may return it to its owner's hand."
Neyith of the Dire Hunt80%
$12.49↑#4228↑0.33↑6.1 years↓
"Whenever one or more creatures you control fight or become blocked, draw a card."
Leery Fogbeast80%
$0.11↓#265930.22↑23.9 years↓
"Whenever this creature becomes blocked, prevent all combat damage that would be dealt this turn."
Saprazzan Raider80%
$0.26↑#318000.36↑26.9 years
"When this creature becomes blocked, return it to its owner's hand."
Deepwood Tantiv80%
$0.25↑#318650.28↑26.9 years
"Whenever this creature becomes blocked, you gain 2 life."