Hallmok, Lurtoth Fortress

Hallmok, Lurtoth Fortress enters the battlefield tapped.
{t}: Add {r} or {b} to your mana pool. Hallmook, Lurtoth Fortress deals 2 damage to you.
{r}{b}: Hallmok, Lurtoth Fortress deals 1 damage to target creature. Spend only mana produced by nonbasic lands to activate this ability.