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Not only does the combo win with Niv-Mizzet, Parun, but you also can spawn an infinite army with any of your token generators

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

This creates a repeatable engine where each two mana invested produces a 1/1 token while simultaneously boosting your board

Illustrated by Pauline Voss Standard Not Legal Alchemy Not Legal Pioneer Not Legal Historic Not Legal Modern Not Legal Brawl Not Legal Legacy Legal Comp

When it was printed, you could use it to sneak a Balduvian Horde into play at instant speed, which wasn't super exciting

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