Alongside the incredibly collectible aspect of Nazgl, the card itself is actually rather strong
Another possibility would be more Collectors Edition cards (with gold borders)
This land card can return a creature to your battlefield from your graveyard if you meet the criteria of controlling seven or more plains
If it was a permanent spell, such as an enchantment, creature, or artifact, they receive their promised gift after the permanent enters the battlefield
I can also see this being used to great effect alongside any commander that makes a lot of tokens
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