I prefer
Tithe Drinker >
Drana's Emissary; I don't think the evasion is worth it for
, and the extort triggers are more punchy if you've got a low curve, and thus access to more triggers. That said, if you only want one, I'd also recommend
Kambal, Consul of Allocation over the two (or paired with
Tithe Drinker).
Since virtually every deck will have
some non-creature spells, Kambal can tax your opponent rather significantly if he's left alone. Even if they immediately attempt a kill spell, he offers a near-guaranteed 4pt life swing (-2 them, +2 you), and if they don't or you can protection effect/recur him, he can represent a whopping 8pt life swing when they come in with a second kill spell, which is pretty great for a mere 3 mana. I wasn't very impressed with him until I drafted with him, at which point, I was really,
really impressed. He goes up in value a lot if your cube is lower/mid-powered, and/or spells-centric, of course, but for fleshing out a section, I think there's a strong argument for his inclusion for
, since he can help swing the game against the aggro/burn decks and strict control decks that
tends to be less favourable to in a lot of lists (and he's also a human, which is often a plus).