Shrouded Purifier

Flying, first strike
Megamorph {3}{g/u}{g/w}{w/u} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up anytime for its megamorph cost and put a +1/+1 counter on it.)
Chase - Whenever another Stormchaser enters the battlefield or is turned face up,you may have Shrouded Purifier fight target red or black creature you don't control.
"When she talks, a whisper. When she flies, a sigh. When she kills... not a sound."