Deathrite Salmon

+1: I'm a plainswalker. Exile target land card from a graveyard. Add one mana of any color to your mana pool.
-1: I'm a plainswalker. Exile target instant or sorcery card from a graveyard. Each opponent loses 2 life.
-1: Still a plainswalker. Exile target creature card from a graveyard. You gain 2 life.