You don’t so much cast a miracle as request one. You state what you would like to have happen and request that your deity (or the power you pray to for spells) intercede.
A miracle can do any of the following things.
Alternatively, a cleric can make a very powerful request. Casting such a miracle costs the cleric 25,000 gp in powdered diamond because of the powerful divine energies involved. Examples of especially powerful miracles of this sort could include the following:
In any event, a request that is out of line with the deity’s (or alignment’s) nature is refused.
A duplicated spell allows saving throws and spell resistance as normal, but the save DCs are as for a 9th-level spell. When a miracle spell duplicates a spell with a material component that costs more than 100 gp, you must provide that component.
The text on this page is Open Game Content, and is licensed for public use under the terms of the Open Game License v1.0a.
Sources:
SECTION 15