Dromosaur 

Creature — Dinosaur
$0.15 #31150 0.36 28.0 years
Whenever this creature blocks or becomes blocked, it gets +2/-2 until end of turn.
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Cards similar to Dromosaur 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.
Brushwagg98%
$1.36↑#309000.12↓30.0 years↑
"Whenever this creature blocks or becomes blocked, it gets -2/+2 until end of turn."
Raging Gorilla96%
$0.17↑#20470↑0.00↓29.7 years↑
"Whenever this creature blocks or becomes blocked, it gets +2/-2 until end of turn."
Chub Toad92%
$0.18↑#22319↑0.00↓31.4 years↑
"Whenever this creature blocks or becomes blocked, it gets +2/+2 until end of turn."
Escaped Null91%
$0.19↑#265680.00↓16.5 years↓
"Whenever this creature blocks or becomes blocked, it gets +5/+0 until end of turn."
Karn, Silver Golem88%
$16.95↑#11943↑0.3328.0 years
"Whenever this card blocks or becomes blocked, it gets -4/+4 until end of turn."
Jukai Trainee86%
$0.01↓#272780.12↓4.7 years↓
"Whenever this creature blocks or becomes blocked, it gets +1/+1 until end of turn."