Okay,
1 Karn, Silver Golem
1 Razormane Masticore
2 Morphling
Karn. Why Karn? You have very little artifacts to animate and attack with, in addition, he's a big clunky artifact creature that you have to hardcast to get into play. His ability to eat moxen is dulled because your total overall mana disruption package is weak.
Razormane Masticore. You should have better Tinker targets. It doesn't seem as if this deck's biggest problem would be small aggro anyway.
Morphling. Old, dated, and simply not needed. These creatures could easily be salvagers which would give your deck the ability to combo out. Even if you didn't replace these big guys with Salvagers, you probably have enough creatures anyway.
The deck is/was my attempt to add blue to an 'artifact prison' deck, because I was focusing on beating combo. Morphling and Tinker went in because I remembered an old ratio for blue cards to FoW, and I was looking at the deck minus the last 5-6 cards and thought 'wow, I just fold to random mono-black aggro'.
I'll point out I didn't set out to make a Trinket Mage deck. I set out to play Sphere of Resistance and Chalice of the Void in a deck with FoW. The missing Salvagers is a really good point; I honestly did not even think of it when I first came up with the list.
What do the weaknesses look like being? Beyond 'almost everything'.
