This will get you a Custom Conjure or Open Conjure of any Special Dragon species, including: 
 
 
Copper Dragon
Bronze Dragon
Silver Dragon 
Gold Dragon 
Platinum Dragon
Rainbow Dragon
Elemental Dragon
Pearlscale Dragon
Crystal Dragon
Dark Crystal Dragon
Reiki Dragon
Time Dragon
Void Dragon
Demon Dragon
Origin Dragon
Seraph Dragon
Psionic Dragon
Lake of Silence Dragon
Glacier Dragon
Gem-Bearer Dragon
Runic Dragon
 
Or you could do a fully open conjure, and you might get a species that is not listed here!
For more info on these species, please see the Special Dragons Encyclopedia Page.