Astrea, The Hunted

: When a Dragon an opponent control dies until the end of your next turn Dragons you cast gain Haste
+2: Each opponent creates a 5/5 red dragon token with flying and "at the beginning of this creatures controller's upkeep they lose 3 life"
-7: Exile Astrea, The Hunted and return her to the battlefield transformed as Astrea's Dragonslayer