But let me ask you this: If I ramp out Rafiq on turn 3 and your turn-3 play is Helga, Skittish Seer, who do you thinks going to win that game
Leovold, Emissary of Trest A common story among the upper ranks, Leovold, Emissary of Trest was an amazing card-draw (for you) and draw-hate (for your foes) Sultai commander until, victim of its own success, it was banned from EDH
And you get to mess with your own library too
While the cards exiled stay exiled, this generally doesn't matter when you can cheat out a game-ending permanent
The whole idea is that you get a big scary creature into the graveyard, and then you bring it back with a cheap spell, getting a significant discount and ideally riding that creature to victory