If the spell that's copied has an X whose value was determined as it was cast (like Rolling Thunder does), the copies have the same value of X
While obviously I can't speak from the POV of a TCG novice, I'll note that my first opponent, who'd not played Magic before, picked it up pretty swiftly (and whalloped me in game two)
Creature - Human Wizard Creature (CTRL to add secondary) Draw Draw (CTRL to add secondary) Enchantment Enchantment (CTRL to add secondary) Instant Waterbender's Restoration As an additional cost to cast this spell, waterbend
So yes, Etali, Primal Conqueror is an extremely good pay off in the command zone for decks that win with Food Chain, if you can keep casting a creature such as Squee, the Immortal from exile to generate 10 million mana or something
Then when you cast your first enchantment each turn you draw a card, so she is a Vesuvan Enchantress in the Command Zone but just once