You choose how many targets Officious Interrogation has and what those targets are as you cast it
That's exactly what surveil lands provide: an alternative, fetchable land that provides value in situations where you don't need untapped mana right away
Roots of Wisdom Again they are working these insurance policies into cards, so you get to mill, you get to return a land or elf, then if you can't (not choose not to) you get to draw instead
You know, the namesake card of the deck
Elas il-Kor having deathtouch also means it's perfectly capable of trading off in combat, despite most Blood Artists being frail and useless as attackers or blockers
While Winota has fallen out of favor recently, Kinnan remains one of the best overall Commanders in the format