He anticipated selling it for around $4,200, but he ended up getting $6,500 for it
There's probably a weird corner case where you want to have different named copies, but I sure can't think of any reasonable enough to warrant this
You may look at and cast that card for as long as it remains exiled, and you may spend mana as though it were mana of any type to cast that spell. Getting your pick of the top four cards of the best players deck is always a good thing, and because you can cast it even if Gonti dies, it makes the whole thing highly profitable
To determine the total cost of a spell, start with the mana cost or alternative cost you're paying (such as a flashback cost), add any cost increases (such as kicker costs), then apply any cost reductions (such as that of Lyse Hext's second ability)
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But this is not representative of the total sum of potential competitive brewing ideas