The content of this product are the same for any box and contains identical cards.
Chapter III in particular makes attacking feed you cards, so sometimes Shiva plays out like two turns of Moat. You can also try to combine this with other stun effects to draw extra cards, though there arent many of those (mostly just Ice Flan and Omega, Heartless Evolution)
It doesn't copy whether that creature is tapped or untapped, whether it has any counters on it or Auras and Equipment attached to it, and so on
Im most excited in the shenanigans you can get up to with letting it go to the graveyard (as your Commander) and then later exiling it to grow a different creature, before sending it to the Command Zone as a replacement effect
With Mirari, Cunning Wish could copy itself and get back another Cunning Wish plus a sideboard card, leading many games to end in a fury of Elephant and Spirit tokens via Mirari and it's Mirari's Wake
Pest Infestation is an absolute workhorse in this archetype, offering scalable artifact and enchantment removal while flooding your board with Pests