Get a scroll of Lesser Planar Binding. Bind a Mirror Mephit (Expedition to the Demonweb Pits). Debuff its charisma checks. Convince it to perform the open-ended task of obeying all your instructions. Order it to use simulacrum to make efreeti simulacrums, and order it to order them to give you wishes. Use those wishes to set up a stable wish loop, and kill the mirror mephit. Use your arbitrarily large number of wishes to pwn the kender.