Alt-Art cards have a variety of designs with special illustrations different from standard cards
If the copied creature was copying something else, then the tokens enter the battlefield as whatever that creature copied, with the exceptions noted above
Some of the most valuable metallic Pokmon cards include: The Shining Charizard
The copy is created in and cast from exile, so effects such as that of Aven Interrupter's last ability will apply
Getting a 2/2 with upside and drawing a Mountain is pretty good for 4 mana, and you can do it again from the graveyard
It can't be the target of spells or abilities, its static abilities have no effect on the game, its triggered abilities can't trigger, it can't attack or block, and so on