Alcryst, Doubting Prince

Reach
Once per turn: Destroy target creature with flying.

Whenever a creature an opponent controls dies, put
a +1/+1 counter on Alcryst.

If Alcryst has 4 or more +1/+1 counters, he gains First Strike.
If Alcryst has 8 or more +1/+1 counters, he gains Double Strike