digimon bt21 booster box Amazon.com: Bandai | Digimon: World Convergence (BT21) Display | Trading Card Game | Ages 6+ | 2 Players and the set also includes alternate art and/or special design cards Digimon Card Game Booster World

What comes to mind are: "Power of the Guardians" and "Dimension Guardian"

manga and anime series, play as a duellist, commanding monsters, spells and traps in an exciting trading card game, complete with beautifully drawn cut scenes and animations

SDY-021 - Monster Reborn

Chain Cartesia Fusion Summon Granguignol with Lubellion and Cartesia as materials

Key searchers for the Egyptian Gods include "Soul Energy MAX!!!" (if it is in the GY, which can be done with "Foolish Burial Goods") for Obelisk, "Thunderspeed Summon" for Slifer and Ra (requires setup of Three Musketeers of Face Cards), and "Ancient Chant" + "The True Sun God" for Ra

From here, you can add Tri-Brigade Nervall from your deck to your hand