arkham horror card game uk FFG | The Game: Deluxe Expansion Promos are available at UKGE

It's possible for High Sentinels to hit the board as a 4-mana 5/6 flyer or larger with no extra work, and if not it gets to that point on its own anyway

They wont update if the exiled cards power and toughness change

Note that there are restrictions on some products, and some products cannot be shipped to certain destinations

Just like other more common and yet more expensive Legend of Blue Eyes cards such as Dark Magician and Blue-Eyes itself, it seems it is prestige that accounts for the difference

Also they are treated as having the same Type, Attribute, Level, ATK, DEF and Monster Effect as the existing card