Threedia of Wind

: Dragons you control have haste, vigilance, and first strike
+3: Up to three creatures get -3/-0 and are unblockable until those creature's controller's endstep. Each opponent draws a card.
-12: Create 7 4/2 dragons with flying, haste, vigilance, skulk. Each opponent gains 5 life. Exile Nees then return her to the battlefield transformed