I haven't cubed with it in a long time, so it's possible my memory is skewed. But then again, we've gotten a lot of cards in recent years, and if Bloodseeker wasn't working out back then, it's got even more competition now.
I had Altac Bloodseeker in my cube very early on, and it basically didn't do anything. I don't think I've ever seen it with more than one trigger. It's also awkward conceptually, it's an aggro card, but if you play aggro you'll have lots of creatures and not as many removal spells. Maybe there is a creature-light aggro-control deck where it's good, but it didn't work for me. Not sure I'd even give it a 1, but I suppose it is 1, given other cards with that rating.
I was initially thinking about grouping Dirty Rat with Ravenous Rats / Corrupt Court Official, then realised it was a Host. I guess as cards on their own they are exactly the same, but I put all the host and augment cards in the 'only for specific cubes' camp by default. If I saw a Host, I'd have to assume there were augment cards in the cube. Maybe I should group the playable ones, and add caveats in the description about misleading drafters if you choose the Host version and don't have augments?
There should be something like that in the descriptions I think. Paying attention to what kind of expectations you're setting by including certain cards is important. (edit: because with the augment cards it might actually influence drafting behavior)
The problem with a solo raptor is that any sort of evasion turns it into a pretty horrible 4 mana 2/2. It's not even close to a threat in a race, so it's mostly a defensive card, but most aggressive decks have some sort of evasion. Even if they don't, the only removal that triggers his ability are the red damage spells. You're not going to get that many trades which allow you to kill a second creature with the trigger in my experience, because it is only a 2/2 and can't compete with most of the other four drops in the stat department, never mind the five drops. If you can abuse the raptor it can clean out very impressive boardstates very quickly, but if you can't, you're likely stuck scraping the floor below the bottom of the barrel.
Moment of Craving at 1 seems fine to me. The incidental lifegain is surprisingly relevant. Sometimes, if you have to, you can even fire it off just to shrink something and "gain" 4 life total. Of course it's worse than the one mana variants, but it's a decent choice if you want multiple of these effects or want to depower.
The problem with using P1P1 is that draft strategy is closely, but not directly related to the absolute power-level of the cards. There are other factors as well. I think it can be an indicator, but we shouldn't use it as the sole measure, otherwise a card like Reflector Mage gets shafted even though it would be really hard to argue that a cube without Reflector Mage is not less powerful.
I agree with the list, except for Tormented Hero. I'm not sure I've seen his effect trigger even once, in my experience it's just a vanilla 2/1, so category 2.
Vanguard has been very impressive for me, but I haven't had too many games with it. The more toughness based removal a cube has the worse it gets obviously, but since only black has those cards...
I've only played against Armasaur once on Arena, but there it was tricky to deal with indeed. I'd consider it for slower cubes, cubes light on removal and cubes with a pants theme. As a 2/3 for four mana it's probably a bit too small/expensive for most "regular" cubes though. So I guess that's a 1.
That said, I do use packs of 12.
There should be something like that in the descriptions I think. Paying attention to what kind of expectations you're setting by including certain cards is important. (edit: because with the augment cards it might actually influence drafting behavior)
Totally forgot about the ballistas! Silly me.
I've only played against Armasaur once on Arena, but there it was tricky to deal with indeed. I'd consider it for slower cubes, cubes light on removal and cubes with a pants theme. As a 2/3 for four mana it's probably a bit too small/expensive for most "regular" cubes though. So I guess that's a 1.