"Wanna buy a lottery ticket or something?" "I don't think I've got any gambling luck…"
Literal
Lottery [or-something-でも] buy? / I, gambling-luck [or-things-とか] doesn't-seem-to-have [and-し-なぁ].
でも after a noun is the 'X or something (similar)' particle, used in casual invitations to leave the alternatives open-ended. The reply uses 無さそう ('doesn't seem to exist') — the ~そう stem-attached auxiliary for appearance. だしなぁ closes the clause with し (listing a reason) + なぁ (reflective sigh), both of which soften the refusal by trailing off.