Last because you need absolutely everything else in place before this will be "fair". You need people who CAN cast life spells before you can have people who need it; otherwise you have a GK-like situation where All you need to do is buy a Life Potion, h'yuk, it's only 600p. Works out to mining 12,000 gold nuggets, no problem at all for a newbie!
Rapidfire death happens in quests. You put in a boss - a dangerous boss - and set it so it attacks anyone who touches it. Then players stand still and let the boss touch them instead. Well that will never do! So you have the boss attack anyone on any tile it occupies. Suddenly it drains everyone in the level to 0 health within a second. Oops! So you fix that, now it only drains the person touching it to 0. D'oh! So you put in a delay, but already at least 2 people need to be "restored", probably a lot more. And that's assuming they repop somewhere safe; if they revive where they died, they get the pleasure of dying again immediately. If they repop somewhere safe with full health, they can run from anyone who attacks them; otherwise you get PKs who stab you back to 0, wait for you to get up, stab you back to 0 again...
Then there's balance issues. Surely those who have been playing longer deserve to be stronger than the newbies, but by what scale? Can an oldbie stab a newbie to death in 3 hits? 2? Then newbies hardly have a chance to run; they need some manner of protection. Noplayerkilling zone? There's still no command to clear that...