Chest Burster

Enchant Creature.
When Chest Burster enters the battlefield, put 3 incubation counters on enchanted creature.
At the beginning of each upkeep, remove 1 incubation counter from enchanted creature. Then, if there are no incubation counters on that creature, sacrifice Chest Burster, Destroy Enchanted Creature, and put a 10/10 Alien Horror creature token with Skulk, Indestructible, and Deathtouch onto the battlefield