The Seriema has real upside as a spacecraft that can eventually do some great flying damage and protect those legendaries by granting indestructibility
Its hard to really combo off with Szarekh because his trigger is tied to attacking, but when the rest of the deck is so explosive (and trust me, it is), sometimes you just need a Commander who can keep you supplied with fresh options
This mobile machine gun shows up in Constructed in everything from fair decks to those comboing with Heliod, Sun-Crowned, but you better believe seeing this in Commander means infinite combo central
It also has cycling, so it can be useful even if you dont have an appealing target
Some locations may not have had their promos yet or might not know about them, its worth checking before visiting
#4 Idc if he's the mascot, no pokemon needs 500 cards