Combine a one-off colour variant, a secret-rare slot at the very end of the set, and the most popular Legendary in the franchise, and you get a card that has appreciated more than 1,800% since release
When the Ring tempts you, return Ringwraiths from your graveyard to your hand
The point of this card is that its good enough to justify playing without too much work
At 100 microns thick, they dont feel cheap and they hold up to repeated handling, making them perfect either for sleeving cards in your decks or for storing your more precious, valuable cards
Another aspect of untapping as a cost is that it can provide a reward for tapping your creatures outside of combat
After being pushed around since hatching until level 20 I think Id have some anger issues as well