You dont need to buy hundreds of booster packs to put a deck together before you fully understand what a deck should look like, or even how you like to play
e-Card era (Expedition through Skyridge) : Used a three-digit format with a different organizational structure
Blue aggro takes significant damage from Phyrexian mana, and Mono Red can capitalize on it
A prime example is this version of Sheoldred, the Apocalypse as "Khan, Engineered Evil," which depicts the incarnation of Khan from the Kelvin timeline
Then, Charizard swoops in and deals massive damage with Inferno X, so much synergy
Some sets are in higher demand than others, so its good to understand which sets are the most popular