Magic has had what are called "modal double-faced cards" before that allow you to cast either side from your hand, but this is the first I know of that also allows you to pay a cost to flip it while the front side is already in play - in this case, you can play Peter Parker for two mana, and then pay four more on a later turn to have him transform
[24] And if the steps above have been helpful, be sure to download this article as a PDF so you can print, read, or reference it any time
Unless otherwise stated by an individual card, of course
engaging in behavior determined in the discretion of BSJ or Producer to be disruptive, in violation of a Public Health Entry Requirement, or creating a safety or health risk for you, another Patron, any other person attending the Event, BSJ, Affiliates, Producer, Artist, or Production Personnel, are all strictly prohibited
The thing about lands in a list like this is that you want to edge on the lower side, because excess lands means youre going to hit too many off of Nahiris triggers
Im obviously exaggerating, but there are some legitimate parallels