Why didn't the Stewards of Gondor ever claim the throne?

Why didn't the Stewards of Gondor ever claim the throne? gondor Horn of Gondor Attachment Cost: 1 Item Artifact Attach to a hero Restricted Response: After a character is destroyed, add 1 resource to attached hero's gondor When Errand-Rider of Gondor enters the battlefield, draw a card Then if you don't control a legendary creature, put a card from your hand on the bottom of

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