Grafted Exoskeleton 
Artifact — Equipment
$5.69 #2301 0.98 15.9 years
Equipped creature gets +2/+2 and has infect. (It deals damage to creatures in the form of -1/-1 counters and to players in the form of poison counters.)
Whenever this Equipment becomes unattached from a permanent, sacrifice that permanent.
Equip 
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Cards similar to Grafted Exoskeleton 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.
Tainted Strike84%
$2.83↓#23521.08↑15.9 years
"Target creature gets +1/+0 and gains infect until end of turn."
Grafted Wargear78%
$0.31↓#9255↓0.05↓22.3 years↑
"Whenever this Equipment becomes unattached from a permanent, sacrifice that permanent."
+1 more matching line
Stitcher's Graft78%
$0.13↓#21814↓0.00↓10.1 years↓
"Whenever this Equipment becomes unattached from a permanent, sacrifice that permanent."
+2 more matching lines
Corrupted Conscience76%
$0.62↓#5873↓0.9515.6 years
"Enchanted creature has infect."
Phyresis76%
$2.39↓#2911↓0.9015.6 years
"Enchanted creature has infect."
Triumph of the Hordes74%
$11.23↑#1177↑1.52↑15.3 years
"Until end of turn, creatures you control get +1/+1 and gain trample and infect."
Glistening Oil72%
$12.20↑#6875↓0.56↓15.3 years
"Enchanted creature has infect."