Sponaneous Domain Casting: Interesting character options?

[Tohron]

Spell Domain would let you pull out regular and greater Anyspell spontaneously. You will still be imitating spells 1 level or more below the slot used, but the ability to prepare any spell 5th level or below in a 6th level slot, spontaneously, is pretty hard to beat in terms of versatility. And you can take advantage of things like Dimension Door being a 2nd level Trapsmith spell to prepare it through regular Anyspell.

Rary's Mnemonic Enhancer and Limited Wish add even more versatility options.