I am already running spectral searchlight, and indeed it is going to be an easy swap for Vessel. I also know that TSG's list also runs manalithe, which is strictly worse than this, so.... I think vessel will find more play than you expect.
A couple of cards I'd like to get your opinion on:
Archwing Dragon - I'm testing this in my larger cube (540). I think it could be the second coming of Hell's Thunder, which is definitely a 540 staple, and would Archwing Dragon crack your top 20.
Vessel of Endless Rest - Better or worse than Darksteel Ingot? I replaced the Ingot with this card, and I think the Ingot is good enough for 540, which would make it better than many of the cards you reviewed.
I'm glad someone else thinks Vessel is good. I'm definitely adding it to my 445 cube. Also I think the miracles are worth testing. I'm definitely trying thunderous wrath when I get one.
I'm glad someone else thinks Vessel is good. I'm definitely adding it to my 445 cube. Also I think the miracles are worth testing. I'm definitely trying thunderous wrath when I get one.