The first number and letter are the simulator version
Yes, it destroys your opponents monsters if they get cocky with their summoning and choose to attack, but it does not deal any damage when triggered
Compleated is a replacement effect, and it applies only to a permanent that is entering the battlefield with loyalty counters
The pros being that it is a creature that can potentially have an Indestructible counter on it that can attack and block
Develop has been a decent card but is adding 1 more ink to the cost worth being able to look at two extra cards
Hangs around with: Visions of Ruin, Blossoming Bogbeast, Maskwood Nexus, Fangren Marauder, Silverback Elder, Well of Lost Dreams