Its casting cost is less restrictive, it can go in a wider range of decks, and it doesnt have flying, so it dodges one type of removal (albeit not the most popular)
Holofoil Rare A Holofoil Rare looks essentially the same as its Regular Rare version, except it features a holofoil finish on the Pokmon art portion of the card
Watermark: Jeskai Illustrated by Jake Murray Standard Not Legal Alchemy Legal Pioneer Not Legal Historic Legal Modern Not Legal Brawl Legal Legacy Not Legal Comp
Market Note: These usually trade higher than standard Double Rare cards but lower than Special Illustration Rares. Exceptions (like a Shiny Charizard ex) can be worth much more
Combined with the frankly outrageous state of things back then (4 Ancestral Recall , anyone?) leading to prolonged game states and impasses, WotC decided that enough was enough and restricted Ivory Tower
When constructing your deck, you are allowed up to four cards with the same name