And Standard is full of ways to make tokens, like job select in Final Fantasy, offspring in Bloomburrow, and mobilizing in Tarkir: Dragonstorm
My guess is that he is assumed to be an inclusion in one of Standard's most powerful decks at the moment, Izzet Prowess
If the spell that's copied has an X whose value was determined as it was cast, the copy has the same value of X
If it is no longer on the battlefield at that point, use its power as it last existed on the battlefield
First up are Saga Creatures, a first of its kind implementation of the Saga mechanic first introduced in 2018 with Dominaria
So even if it is worth buying stores out of Built from Scratch next Friday, it won't be for long