"Pokemania" was on the way out, and that meant a lot of the Pokemon TCG expansions at the time suffered from lower sales and smaller print runs
The Pokmon centres (listed below) have booster card pack cases (the type that people collect but never option.)
Its a popular mechanic, and occasionally shows up in commander products, so you should be familiar with it
Various ways to use Caius and Lindorm Official Monarch Deck Recipe 1 Caius the Shadow Monarch (LEGEND) 1 Estrome the Mega Monarch 1 Hebe the Star Vassal 1 Wilhel the Mega Monarch 1 Zuse the Wisdom Vassal 3 Lindorm the Mega Monarch 3 Lindom the Dragon Monarch 3 Drache the Dragon Vassal 3 Tribute Kaiser 3 Criatura Brazo 3 Negatwor Dragon 3 Jundee of the Dark Path 2 Justiciar of the Dragon Stream 1 The Monarchs Stormforth (LEGEND) 2 Pot of Duality 1 Invasion of the Monarchs 3 Triumph of the Monarchs 1 The Jest of Princess Cosmos 1 Negate Attack (LEGEND) 3 Perserverance of the Monarchs Tactics: Make full use of the new Monarchs and their effects to flexibly deal with various battle states
One of many examples is the common black card Catacomb Crocodile, whose flavor text shows a talking rat and zombie arguing about who is the true king of the Ravnican sewers
The deck wins by staying unpredictable, forcing opponents to respond to shifting threats instead of executing their preferred strategy