Kusari-Gama {3}
Artifact — Equipment
Equipped creature has "{2}: This creature gets +1/+0 until end of turn."
Whenever equipped creature deals damage to a blocking creature, this Equipment deals that much damage to each other creature defending player controls.
Equip {3} ({3}: Attach to target creature you control. Equip only as a sorcery.)
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Cards that do something similar expected a card that isn't here?
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Neko-Te 90%
$5.09#18717
"Whenever equipped creature deals damage to a creature, tap that creature. That creature doesn't untap during its controller's untap step for as long as this Equipment remains on the battlefield."
+1 more matching line
Enormous Energy Blade 88%
$0.16#23067
"Whenever this Equipment becomes attached to a creature, tap that creature."
+2 more matching lines