Four of the five (including the uncut sheet) do indeed have the typical core as they are printed on the same stock as normal Magic cards of that era
If so, it isnt targeting anything and can impact cards with hexproof
of course, these days its easy to collect a set of four Mythic Rares if you can afford to thanks to sites such as Cardmarket, eBay and others but back when MTG was first released, it wasnt as straightforward to find specific cards in the wild
Hareruya Japans most well-known Magic-focused store
Yes, unless the card specifically says enchant a creature you control. This is actually a great strategy with cards like Darksteel Mutation to neutralize an opponents threat without letting them recast it
(Each booster pack contains 10 game cards, 1 Basic Energy, and 1 Pokmon TCG Live code card