Holofoil cards, also called 'foil', 'holos' or 'shiny', are made with an extra layer on the card itself that gives a shimmering effect that is more noticeable and can look almost metallic or glittery
That said, there are likely much more efficient ways to go infinite in formats where you want this, like Commander
Those feeling stale with their current Commander decks can upgrade plenty of them just as easily with this set
Theme Boosters Every game is a new campaign in the Adventures in the Forgotten Realms Theme Boosters, with 35 cards for your favorite type of deck, and at least one Rare or Mythic Rare
Having a release valve for powerful cards in older formats that try to lock you out of the game is extremely useful
Thats the key question as we see the format shake out