Advanced collectors will pick these lots up just as a way to fill missing cards they have from past-generation sets or fill out common cards, which are often needed as part of building out a tournament-legal deck
However, as time passed, another card stood out as the best card in "Temporal Forces"
During the end phase you destroy the special summoned monster
Companions were cards that, like a commander, could be cast from outside the game
Thing is, this is going to have long-term effects for more than just Paul
In fact, the Zendikar Expeditions, Kaladesh Inventions, and Amonkhet Invocations all came before, in what was called the Masterpieces series (Ixalan, too, was to have these called Explorations, but this line was canceled before production)