There are a few reasons to get booster boxes, although the main reason is because they typically offer the best value-per-pack
One such recent card, which ended up being a haymaker in Standard, is Archfiend of the Dross
Ariel has 3 Strength, an impressive 8 Willpower, and 2 Lore when Questing too
This is depicted in a Red, White, and Black card called Fire Lord Zuko, which retains its firebending mechanic, but now has possible combos in MTG tied to ally creatures and casting from exile, which airbending does a lot of
While not an important detail in all games, giving another blue player extra mana can open up the opportunity to derail your plans if youre caught by surprise