Competitive Teferi, Temporal Archmage Critique

Hey everyone, looking for constructive comments and critiques of my [[Teferi, Temporal Archmaged]] deck. Mainly, should I go heavier into artifacts with [[Metal Worker]]? Following this, I am looking to add [[Grim Monolith]] to the deck. I haven't been tuning too much in the last 3 months so if there are new cards in recent sets that are not included I would appreciate a comment.

Meta: I am planning on taking this list to multiplayer side events at GP's. I am aiming for the deck to be fast to combo off with back up or stax people out. I would rather beat other combo decks then midrange if there are flex spots in the list.

List: http://tappedout.net/mtg-decks/teferi-fun/

Edit: I have gotten great feedback so far, thank you CEDH!