Multicolor Thanos, the Mad Titan Saffgor: The funny thing is that I don't actually think Thanos is especially good as a wipe
While additional copies were destroyed, it's uncertain whether the printing plates were preserved, so theoretically, another could be produced
Itll have to be a red or colorless dragon due to color identity, but you can get heavy hitters like Hellkite Tyrant or Ancient Copper Dragon, just to name a couple that benefit you when they deal damage
The most expensive example of the card we found was this version, sold on eBay in January 1, 2025
Ultimecia, Temporal Threat** Ultimecia here is a wonderful target to blink, and her tapping creatures lets your guys get in and take advantage of the Coastal Piracy style draw effect
If there is a card that will cause people to buy these decks to complete a play set for Legacy, I think this one is it