Chainflail Centipede 

Artifact Creature — Equipment Insect
$0.12 #21559 0.05 4.5 years
Whenever this creature or equipped creature attacks, it gets +2/+0 until end of turn.
Reconfigure
(
: Attach to target creature you control; or unattach from a creature. Reconfigure only as a sorcery. While attached, this isn't a creature.)
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Cards similar to Chainflail Centipede 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.
Razorfield Ripper91%
$0.27↑#7471↑0.32↑2.2 years↓
"Whenever this creature or equipped creature attacks, you get
, then it gets +X/+X until end of turn, where X is the amount of
you have."
+1 more matching line
Tanuki Transplanter82%
$1.24↑#6427↑0.83↑4.5 years
"Whenever this creature or equipped creature attacks, add an amount of
equal to its power. Until end of turn, you don't lose this mana as steps and phases end."
+1 more matching line
Rampaging Classmate78%
$0.18↑#252440.26↑0.9 years↓
"Whenever this creature attacks, it gets +1/+0 until end of turn for each other attacking creature."
Akroan Hoplite78%
$0.09↓#16217↑0.88↑12.9 years↑
"Whenever this creature attacks, it gets +X/+0 until end of turn, where X is the number of attacking creatures you control."
Fervent Charge77%
$0.42↑#5232↑0.25↑25.3 years↑
"Whenever a creature you control attacks, it gets +2/+2 until end of turn."
Hungry Spriggan76%
$0.10↓#28245↓0.29↑18.3 years↑
"Whenever this creature attacks, it gets +3/+3 until end of turn."
Glory Bearers76%
$0.03↓#26122↓0.33↑6.6 years↑
"Whenever another creature you control attacks, it gets +0/+1 until end of turn."