What is death's role? Fast rusher? Big staller?
Vultures are flying bags of fluff. Make a deck with 5 of them and it can not be an OTK.
Plague! Make a deck with at least 5 plagues. It's an UU card that should see more usage.
Bonewall or Bone Shield? Which is better? Why?
I do not believe that Death - or any element for that matter - has a role. I find it narrow-minded when people say something like "Death can't have healing because it's Life's and Light's domain" or "Card drawing belongs to Time" or even worse "Random stuff? Entropy!".
So Death has no particular role. There are certain
themes though: profit from death, the undead and poison.
I realize though that you aren't talking about thematic role but a mechanic role. In that regard, I believe Death is better at rushing than stalling. Even then I wouldn't call it a role because it can do both well.
It is common knowledge that mono death rush is among the fastest mono rushes in the game. You can also easily splash stuff into it making it quite versatile. With stalling, it's a bit harder. I generally differentiate two kinds of Death stalls: Bonewall-stalls and Deckout stalls. The former uses Bonewalls with some form of creature control to prolong the game while the poison kills the opponent. The other group contains the immortal-like decks, that use healing and some form of control to survive while the opponent decks out. Damage can also be used here, but it is usually hard to fit into the deck due to space limitations.
So to summarize, Death cards lend more to rushing than to other strategies.
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I know this may probably not considered to be the most original deck ever made with vultures, but you must admit that possibilities are quite limited. Vultures cannot be used with many cards, and even with those cards they are subpar. Because I don't like relying on my opponent to provide me with death effects two possibilities remain for me: ball lightnings or cats. While fractal balls may build up damage faster I like the stability of this deck. I must also admit that Entropy is closer to my heart than Aether. Bonewalls keep you safe while your damage gradually builds up. Pandemoniums can provide a little damage boost and can help you keep your bonewall up.
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Honestly, I'm a lazy person and I don't like working twice for no reason. (Despite that this is the 3rd time I'm typing up my answer to you because of the dreaded back button.) So if you don't mind I'm just going to put here the deck I built for ARTHANASIOS from above which fits the 5 plagues requirement perfectly.
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Bonewall vs
Skull Shield
Can't say one is better than the other. They have different uses and purposes; they are actually quite contrasting.
Unlike most shields, Bonewall is better against a few but big hitters. Because of the ability to completely block many attacks it is understandably quite expensive. On the contrary, Skull Buckler is better against swarms of smaller creatures both because more damage is blocked and they usually die faster to it. Skull shield is very cheap for its effect - some people even argue it is too cheap - so it can be put into almost any deck. It requires no planning around or anything like that which is another difference compared to Bonewall. If you want to use Bonewall to its full effect, you will need to dedicate your deck to it. You will need to trigger death effects to maintain it. You can use it without support cards but then you shouldn't count on it lasting for more than a turn or two. Another important note is the fact that Bonewall is very resistant to permanent control, unlike Skull Shield which can simply be stolen and may turn all your creatures into pathetic skeletons.
I believe that is all. Neither is better than the other, just different. But in their difference they complete eachother well: when going against Death you will need to prepare against both.
Personally I love Skull Shield more than it's more expensive brother since the buff it received. I just find the turn-to-skeleton effect ingenius and the fact that it's so different to Bonewall great. A bit luck-based, but you can always increase your odds with some control.