Declare Progenitor as your only attacker, allowing you to deal enough commander damage to instantly take out the other player
Id slip it into a deck with some ways to recoup your life, and potentially ways to reset it by bouncing it, such as Master Transmuter, or blinking it, such as Teleportation Circle
Phyrexian Cards There are two Phyrexian cards in Kamigawa: Neon Dynasty
With all the cheap and good poison and proliferate cards from artifacts, blue, green and black included the deck still had plenty of space
In short, you get to create a 3/3 Dalek artifact creature token during your end step if an opponent has lost three or more life during your turn
In general, removal spells have become more powerful than ever in the format, so the numbers of Fatal Push declined naturally