Barbarians are Magic's raiders and wild clan warriors, and nearly all of them are red. The type stretches from Dominaria's Balduvian and Keldon tribes to Dungeons & Dragons heroes. Expect these aggressive creatures to attack early and often.
Only two cards act as true Barbarian lords. Balthor the Stout gives your other Barbarians +1/+1 and can pump them further with red mana. Lovisa Coldeyes goes bigger, granting +2/+2 and haste to Barbarians, Warriors, and Berserkers alike, and that wider reach is why she usually leads the deck.