You dont end up losing one of the creatures for good, and you also become the monarch, giving you some extra card draw
This Gold Poke Ball hasnt held up extraordinarily well compared to other cards from the same product, but it is still worth a respectable $9 on TCGplayer 7
Mortality Spear has the potential to become one of the best removal cards in STX Limited, costing two less to cast if its controller gained life the turn its cast
Several have sold for staggering amounts of money (the lowest sold for $100,000), but the most famous example is Pauls PSA 10 card that he privately purchased for $5 million before wearing it as part of his costume during a surreal appearance at WrestleMania 38
The key is how many artifacts, sagas, and legends you can get into a deck, because if you can untap it a few times, this card will win a game for you in short order
It guarantees a land in hand each turn, but I'd challenge that it's ramp at all