Lothlórien Blade 
Artifact — Equipment
Whenever equipped creature attacks, it deals damage equal to its power to target creature defending player controls.
Equip Elf {2}
Equip {5}
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Cards that do something similar expected a card that isn't here?
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Mage Slayer 91%
$1.57#4244
"Whenever equipped creature attacks, it deals damage equal to its power to the player or planeswalker it's attacking."
+1 more matching line
Cyclops Gladiator 82%
$0.17#23913
"Whenever this creature attacks, you may have it deal damage equal to its power to target creature defending player controls. If you do, that creature deals damage equal to its power to this creature."
Swordsman, Sharp Scoundrel 81%
$0.16#23499
"Whenever an equipped creature you control attacks, it connives."