The Dark Wizard

+2: Destroy target creature, it's controller creates a 2/2 Dark Raven creature token with flying and "After this creature attacks, sacrifice it".
-3: Destroy your Dark Ravens, for each one create a 5/5 Dark Dragon creature token with flying and "After this creature attacks, sacrifice it".
-10: Destroy all creatures, each player creates a Dark Raven for each they owned that was destroyed this way, you create Dark Dragons instead.