The Heart of Fire

{b/r}{b/r}{b/r}{b/r} , {t}: Gain control of all dragons in play until end of turn. Untap them.
They gain haste until end of turn.
A king, beaten and bloody called to his mount,
but the dragon did not hear. Guilty for his king's death the dragon linked his soul to a stone of obsidian and gave it to the prince.
"If ever help you need, speak into the rock and all dragons will be your steed."