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It's been a long time since I last played SR3 but if my memory serves me, you could use more than one Karma pool on a single roll in SR3. Espescially on rerolling, that was really powerfull (1 Karma to reroll missed dice, than 2 Karma to reroll again, than 3 Karma, than 4 and so on).
You got to reroll for additional successes, yes, but Edge can do that too,although using edge to add [edge] dice always is more useful, IMO, because it just may double your dice pool.
You could also add dice in SR3, at 1 for 1 die, 2 for 2, 3 for 3, ect. Mr. Lucky adds 9 dice for 1 Edge. That'S worth 45 Karmapool in SR3. Each. Time.
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In SR4 you are limited to one use of edge on a single roll, so I would argue that 9 Edge (which is impossible, by the way, max is 8 for a human Mr. Lucky) are better than 100 Karma Pool.
Extraordinary attribute, Luck, maximum Edge = 9. Or are Ex. Attribute and Luck incompatible? If so, why introduce Luck? And even with the limit, that's still 45 (36 in case of incompatibility) Karmapool spent on that roll in SR3 terms.
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But on the other hand, in SR4 you can start play with a high edge attribute, in SR3 you actually had to "earn" your Karma pool. But when you reach a 3-digit Karma Pool you should have a quite competent character, don't you think?
You sure would. I've never seen one, because at a certain power level you just semiregularily burn Karmapool for hits to stay alive. I've seen more than one four-digit Karma Pool characters and none of them had a 3-digit Karma Pool. Whereas you can have Mr. Lucky in SR4 straight out the box.
So yes, I consider Mr. Lucky far more powerful than anything of that sort you could hope to have as a startup character in SR3.