Blinkmoth Nexus?I think this might be an option beacause:
-It stores counters
-You can beat your opponent with a flying creature that he will not likely be able to block. ( Extremly powerful if you're storing counters on it )
-Pump plating
-Build affinity
-Chump block when crucible is in play
Last three was ripped from somewhere
Goblin Welder:I think the deck would get much more powerful if you added four goblin welder. You could weld up a myr enforcer or somthing and it would buy some defense against artifact removal. It also increases the number of counters on the crusher. Also with fish's increasing popularity I think that all fish players not maindecking 2 Fire // Ice ( Im Maindecking them myself ) will have a pretty hard time getting rid of the welder if they're not topdecking grim lavamancer. When null rod is in play you dont have much use for 2-3 moxes but you will have the better use of your dead enforcer. ( If you have one ) The consequence is that you have to add red mana.
Grim monolith:-This one just give you more mana and works if you want to waste the power in it weld it up and down from your graveyard. ( not to likely )
-I don't know what to pick out of the deck but i think it might work.
Tsabo's web: (SB)
- Good sideboard option against U/R Fish and the deck that has increased in popularity slighly Landstill.
That's the things i wanted to mention that could improve your deck.
Thanks for a affinity deck that possibly is really fun to play?