Sentry Sliver

Xenomorph creatures you control have afflict 2. (Whenever a creature with afflict 2 becomes blocked, defending player loses 2 life.) Whenever a nontoken Xenomorph you control dies, amass Xenomorphs 2. (Put two +1/+1 counters on an Army you control. It’s also a Xenomorph. If you don’t control an Army, create a 0/0 black Xenomorph Army creature token first.)