Call Dragon

Shout (You may pay additional mana to empower
this spell)
+ {x}{x} Od - Search your library for a Dragon
creature with X or less mana. Put it onto the battlefield, then shuffle your library.
+ {x} Ah - Search your library for a Dragon
creature with X or less mana. Put it onto the battlefield, then shuffle your library.
+ {10} Viing - Search your library for Odahviing.
Put it onto the battlefield, then shuffle your library.