Arm-Mounted Anchor 
Artifact — Equipment
Equipped creature gets +2/+2 and has menace.
Whenever equipped creature deals combat damage to a player, draw two cards. Then discard two cards unless you discard a Pirate card.
Equip {2}. This ability costs {2} less to activate if you have one or fewer cards in hand.
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Cards that do something similar expected a card that isn't here?
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Chitinous Cloak 100%
$0.12#16899
"Equipped creature gets +2/+2 and has menace."
+1 more matching line
Draugr's Helm 100%
$0.20#24018
"Equipped creature gets +2/+2 and has menace."
+2 more matching lines
Gisa's Favorite Shovel 99%
$22.69#10478
"Equipped creature gets +2/+0 and has menace."
+1 more matching line
Crown of Gondor 99%
$0.39#5626
"Equip {4}. This ability costs {3} less to activate if you're the monarch."
Plate Armor 98%
$0.19#8504
"Equip {3}. This ability costs {1} less to activate for each other Equipment you control."
+1 more matching line