I'm building a gambler-themed Spellscale Sorcerer, and I was wondering if anyone knew of any good luck-themed spells. I know there's things like Unluck and the various Prismatic/Rainbow spells (the ones with random effects), but what else is there that I might have missed?
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There are two kinds of "luck" spells that need to be considered.
Anecdotally, as someone with horrible luck, having these are futile. Those of us on whom probability takes steaming dumps know that no reasonable number of rerolls will ever produce a satisfactory result (also known as the lie of averages), and having reroll abilities means expending resources that could've instead been devoted to making others roll better or not having to roll at all.
That said, here are some reroll spells and what gets rerolled.
That's... not a lot. As with most things magical, the Clr's ability to pick new spells from the thousands available makes him better at this than a Sor, and the Brd's seeming emphasis on wacky antics lets him access a few unique ones, too. Further, Races of Destiny's spells warp destiny and choose destiny are awesome for this, but they are exclusively destiny Domain spells.
Arguably, any spell requiring a saving throw, attack roll, or damage roll is random. Assuming, however, that the spell's effect should be random, this could easily be a Sor's whole theme as there are so many. Note that lesser confusion is only on the Brd spell list and the madness Domain.
Anecdotally, these spells make other players hate you. Not your character--he didn't make these choices--you. That's because the resources you committed to doing this could have been spent doing something reliable. When you bring Swingy the Luckmaster to the table, expect dice thrown at you.
I’m away from my books and too busy to go digging besides, but there is cheat in Spell Compendium that lets you, well, cheat at games of chance (dice, roulette, and so on). I think it’s just a reroll though.
Psionics has many powers which offer insight bonuses and allows rerolls (Fate of One in particular) in the Clairsentience discipline. Might be worth considering playing a Seer (Psion specializing in Clairsentience).