It's debatable just how much the value of Vivi's Persistence is upheld by the infamy and power of the character in its artwork, and how much it's based on the card's own merits
Both are 6 mana creatures, but Gilgamesh gets a big +3/+3 bump as a 6/6
If youre new to collecting trading cards, it can be shocking to learn just how much some of these cards are valued at
Being a flash threat is important because you can hold up mana, usually representing countermagic
This was the cheap cost of four mana, which meant you could easily go, 1st Turn Forest, Llanowar Elves, 2nd Turn Forest, 3rd Turn Forest, Natural Order, sacrifices the Elves, fetch out Verdant Force