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
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
Desynchronization has a splashy enough effect to potentially see Modern play in the sideboard of a deck like Affinity, but it is, once again, going to be very meta-dependent
(Purple and Gray Starter Deck)
Having a release valve for powerful cards in older formats that try to lock you out of the game is extremely useful
Iconic cards are extremely rare with only two appearing in each set, while Epic cards will appear more often than Enchanted cards and feature special artwork and foil treatments