Malzeno

Flying, Wither.
When this creature enters, create two 1/1 red and black qurio creature tokens with flying, wither and "sacrifice this creature: put a -1/-1 counter on target creature"
Whenever a -1/-1 counter is put on a creature an opponent controls, put a +1/+1 counter on this creature.
As long as this creature has two or more +1/+1 counters on it, it has first strike.
As long as this creature has five or more +1/+1 counters it has double strike.