Of course, the "artifact creatures you control have menace" is a cherry on top for a deck that churns out giant artifact creatures every turn
Costing six and not being able to immediately gain any life means you will have to do quite a lot of work just to get to stage you can make the Wurmcoil with any semblance of safety, if at all
Not all Planes are created equally
If it becomes night, Hound Tamer's Nightbound side, Untamed Pup improves its value considerably, growing it into a 4/4 and providing all other wolves and werewolves with trample while retaining its Daybound abilities
Whenever you cast a spell that targets one or more of your Creatures, the +1/+1 counter is placed on Arcee, Acrobatic Coupe, which is great, but she immediately Converts back to the Robot half that no longer receives +1/+1 counters
But Class abilities can be anythingstatic abilities, activated abilities, or triggered abilities