The Breaker of Armies is a Eldrazi creature, an ancient race native of the Blind Eternities. They always feel the need to eat mana.
Three Eldrazi Titans are known on Zendikar: Emrakul, Ulamog and Kolizek.
Emrakul wars biology; Ulamig, the physical properties; and Kozilek, reality.
It's an illustration intented to be a card from Magic: The Gathering game.