Your Dragons cost 1 less.
Dragon Ally: +2/+1 and Quickdraw.
Card sounds may differ from in-game as they get updated.
Quickdraw - Units with Quickdraw kill blockers before they can deal damage back. Note that Quickdraw only works while attacking, not while blocking.
Ally - Happens as soon as you have a unit of the named type. This can be when you play the unit with Ally or later if there's none of the needed type in play. Ally resets if the unit dies or is returned to hand.