Crown of Gondor {3}
Legendary Artifact — Equipment
Equipped creature gets +1/+1 for each creature you control.
When a legendary creature you control enters, if there is no monarch, you become the monarch.
Equip {4}. This ability costs {3} less to activate if you're the monarch.
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Cards that do something similar expected a card that isn't here?
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Pennon Blade 100%
$0.21#14503
"Equipped creature gets +1/+1 for each creature you control."
+1 more matching line
Horn of Valhalla // Ysgard's Call 100%
$1.12#4796
"Equipped creature gets +1/+1 for each creature you control."
+1 more matching line
Plate Armor 99%
$0.19#8504
"Equip {3}. This ability costs {1} less to activate for each other Equipment you control."
Arm-Mounted Anchor 99%
$0.23#12180
"Equip {2}. This ability costs {2} less to activate if you have one or fewer cards in hand."