When it was printed, you could use it to sneak a Balduvian Horde into play at instant speed, which wasn't super exciting
These are always solid inclusions that can be utilized in various ratios, depending on how much space you have access to in your side
Not only does the combo win with Niv-Mizzet, Parun, but you also can spawn an infinite army with any of your token generators
There's probably some good ways to recur this, but there's also things like Drannith Magistrate to just lock out all your opponents airbent creatures, which is pretty solid
That being said, it is only an Illustration Rare and the Clefairy ex also featuring Lillie will inevitably steal some of this underrated cards thunder
Its a Synchro strategy with no Main Deck monsters at all, built around a floating chessboard Field Spell that shuttles pawn, knight, rook, and king chessmen between your Extra Deck, Monster Zones, and Spell & Trap Zones