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We checked Scryfall and realized that it was not

5 cards per pack 24 packs per box

This is either a continuation of the Secret Lair theme, an extended art Sliver, or a copy of one of the most collectible MTG cards ever printed

Angels EDH Deck 3.0 Commander / EDH* Angels Casual GW (Selesnya) Mono-White Tribal Creature (26) 1x Adarkar Valkyrie 1x Aegis Angel 1x Akroma, Angel of Wrath 1x Angel of Condemnation 1x Angel of Finality 1x Angel of Grace 1x Angel of Vitality 1x Archangel of Thune 1x Archangel of Tithes 1x Avacyn, Angel of Hope 1x Avacyn, Guardian Angel 1x Baneslayer Angel 1x Bruna, the Fading Light Flip Meld 1x Emeria Angel 1x Felidar Sovereign 1x Gisela, the Broken Blade Meld 1x Herald of War 1x Lyra Dawnbringer 1x Platinum Angel 1x Radiant, Archangel 1x Regna, the Redeemer 1x Requiem Angel 1x Resplendent Angel 1x Shattered Angel 1x Sigarda, Host of Herons 1x Twilight Shepherd Planeswalker (1) Enchantment (14) 1x Ashes of the Abhorrent 1x Blind Obedience 1x Dawn of Hope 1x Descendants' Path 1x Ghostly Prison 1x Kindred Boon 1x Land Tax 1x Marshal's Anthem 1x Martyr's Bond 1x Quarantine Field 1x Rest in Peace 1x Rule of Law 1x Smothering Tithe 1x True Conviction Artifact (9) 1x Damping Sphere 1x Grafdigger's Cage 1x Hedron Archive 1x Helm of the Host 1x Lightning Greaves 1x Oketra's Monument 1x Selesnya Signet 1x Sol Ring 1x Thaumatic Compass Flip Sorcery (5) Commander (1) Land (36) 1x Blossoming Sands 1x Emeria, the Sky Ruin 1x Encroaching Wastes 3x Forest 1x Fortified Village 1x Ghost Quarter 1x Nykthos, Shrine to Nyx 25x Plains 1x Seraph Sanctuary 1x Windswept Heath

Before this, I really couldn't find concise written guide to the Adventurer Engine

It's a matter of inches