Bonus sheets from previous sets sometimes have a unifying mechanical theme (in Outlaws of Thunder Junction , for example, all the cards from the Breaking News bonus sheet could commit a crime), but there's no specific mechanical thread connecting these Through the Ages cards
Not only do you Banish all other cards in both players Graveyards and field, you also Banish both hands too
In 2021, a GEM MINT 10 copy of Gaia sold for $4,560, proving that first edition yu-gi-oh cards value remains strong in the collectors market
Here is the detail of the newly revealed cards: If you are on a PC, you can Right-Click the Image and choose 'Open Image in New Tab' for the bigger picture

"Barricadeborg Blocker" makes Field Spells reuseable, "Missus Radiant" can be used to push a little harder since the entire "U.A." line-up is Earth Attribute, the "Knightmares" are well-known and provide various removal effects, "Isolde, Two Tales of the Noble Knights" can be used to search but will often not be necessary, "Abyss Dweller" is a counter option against graveyard-heavy decks, "Evilswarm Exciton Knight" can serve as a field reset, "Castel, the Skyblaster Musketeer" brings non-destruction removal, "Tornado Dragon" is another anti-backrow option, "Number 61: Volcasaurus" can sometimes be used to burn for game, "Number 11: Big Eye" can steal monsters from the opponent which clears the field of one monster to get over while also providing you with another attacker, "Mecha Phantom Beast Dracossack" provides tokens and further removal and "Number 38: Hope Harbinger Dragon Titanic Galaxy" will bring Spell negation
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