Unholy Pelor's Burning Hate, that is fucking PRICELESS. Every spell from 0th up is a Shadow Miracle = DC's to rival a Tainted Sorcerer O.o
Well to be fair you're still limited by the amount of spells you have and the time it takes to cast them until you get to sufficient DCs.
Echoing Spell, Miser With Magic, Chaotic Spell Recall, Persistent Time Stop...I have all the time and spells I need
I wouldn't waste the feat slots if you can use a Shadow Miracle to duplicate the effects of a Twinned Theller's Argauneau (equivalent to a lvl 7 spell)...
...to refresh the spell itself and any one other. Just need a shriveled, preserved nugget of a red dragon egg to fulfill the spell's target line... and the means of duplication in this instance means you can ignore the material component portion of the spell.
Level: Brd 4, Sor/Wiz 3
Components: V, S, M
Casting Time: 1 full round
Target: One red dragon egg
Duration: Instantaneous or 1 hour/level (see text)
Saving Throw: See text
Spell Resistance: No (object)
You drain the life energy from a red dragon egg and absorb it into yourself, which may be used for several purposes.
Healing: Heal 5d6 points of damage as if a cure spell were cast on you. This has an instantaneous duration.
Ability Boost: +2 enhancement bonus to Strength, Constitution, and Charisma, lasting 1 hour per caster level.
Refresh Spell: Regain one cast spell or used spell slot of any level you can cast, similar to a pearl of power except that bards, sorcerers, and similar casters can also benefit from it. This has an instantaneous duration.
A dragon egg is treated as an object, not a creature, and it does not get a saving throw against the spell unless it is in the possession of a creature (and therefore uses the normal saving throw rules for objects in the possession of a creature). If you are not a creature of the type "dragon," you must succeed at a Fortitude saving throw (DC 14) when you cast this spell; failure means you gain no benefit from the spell, take 3d6 points of damage, and are nauseated for 1 round from the sudden influx of incompatible life energy.
Material Component: A red dragon egg containing a living red dragon embryo, worth 2,000 gp.