The cheaty fat man decks can avoid this issue but it isn't super easy
If we think of each block as either new territory or a revisit, we have: Mirrodin [Revisit of Antiquities], Kamigawa [New], Ravnica [Revisit of Invasion] Time Spiral [Revisit of Everything], Lorwyn [New], Shadowmoor [New] Shards of Alara [New], Zendikar [New], Scars of Mirrodin [Revisit of Mirrodin] Innistrad [New], Return to Ravnica [Revisit of Ravnica], Theros [New] Khans of Tarkir [New], Battle for Zendikar [Revisit of Zendikar], Shadows over Innistrad [Revisit of Innistrad] Revisit-New-Revisit-Revisit-New-New-New-New Revisit-New-Revisit-New-New Revisit-Revisit Time for more New then
Top 4 was a train mirror match
During the Battle Phase, the number of monsters on the field may change at any time
However, this randomness occasionally finds its way into the attacks of some Pokmon, and Alolan Exeggutor ex's attack has a chance to be amazing or horrible depending on what happens with a coin flip