Chainflail Centipede 

Artifact Creature — Equipment Insect
Whenever this creature or equipped creature attacks, it gets +2/+0 until end of turn.
Reconfigure {2} ({2}: 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 that do something similar expected a card that isn't here?
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Lurking Nightstalker 86%
$0.25#31306
"Whenever this creature attacks, it gets +2/+0 until end of turn."
Borderland Marauder 86%
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"Whenever this creature attacks, it gets +2/+0 until end of turn."