instruction: Who is the Artist with an Issue Price (BU) [Clarification Needed] of n/a along with a Year larger than 2004, and Mintage (Proof) of 25,000?
response: SELECT "Artist" FROM table_10823 WHERE "Issue Price (BU)[ clarification needed ]" = 'n/a' AND "Year" > '2004' AND "Mintage (Proof)" = '25,000'