Spare Dagger {1}
Artifact — Equipment
Equipped creature gets +1/+0 and has "Whenever this creature attacks, you may sacrifice Spare Dagger. When you do, this creature deals 1 damage to any target."
Equip {1} ({1}: 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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Sunfire Torch 97%
$0.10#21889
"Equipped creature gets +1/+0 and has "Whenever this creature attacks, you may sacrifice this card. When you do, this creature deals 2 damage to any target.""
+1 more matching line
Dire Flail // Dire Blunderbuss 80%
$0.23#13626
"Equipped creature gets +3/+0 and has "Whenever this creature attacks, you may sacrifice an artifact other than Dire Blunderbuss. When you do, this creature deals damage equal to its power to target creature.""
+1 more matching line