Given how down everyone is on
Phyrexian Arena these days, seeing it ranked higher than
Night's Whisper seems a little odd, and the difference between D and B is also odd. Drawing "only" two cards is a very different prospect when you also only cost 2 mana, otherwise
Breakthrough and
Kozilek, Butcher of Truth would be top-tier.
Thrill of Possibility is great, but shouldn't really be considered in the same category as it's selection, not draw.
Faithless Looting actually puts you
down cards. Sometimes selection is as good as draw but often the distinction matters.
How would you rank "The one ring" ?
Not OP but I'd say E. It's expensive, draws very little, you have to wait around, it hurts you. Think Phyrexian Arena but worse.
The One Ring definitely outclasses Arena. By the time Arena draws you one card, TOR has drawn you three. Even if Arena comes down a turn earlier, because it costs less, it's two cards vs three two turns later. The fact that you're taking a four-mana turn off instead of a three-mana turn is more than outweighed by the far easier casting cost, too (if it even matters; often, even in quite casual games, you play a mana rock or other two-mana ramp on T2 then have four on T3 anyway - and with very low-powered decks you want T3 to play your 3-mana rocks!).
Oh also it gives you protection for a turn. If you play that turn 3, probably nobody cares, but it means that drawing this late it's less likely to be a dead card. Drawing Arena late feels really bad; this is a fancy
fog that cantrips, which isn't good but could be good enough.
(And that's not counting your options with proliferate, untapped, bouncing, etc)