CREATE TABLE table_name_12 (year VARCHAR(255), runner_up VARCHAR(255), winner VARCHAR(255), venue VARCHAR(255))
When is the winner olympiacos, the venue is georgios karaiskakis stadium and the runner-up is iraklis?
    
SQL: SELECT year FROM table_name_12 WHERE winner = "olympiacos" AND venue = "georgios karaiskakis stadium" AND runner_up = "iraklis"