The mana seems a bit low. You dont have enough low drop artifacts to get to Herald fast enough. I love the grixis approach, but seems slow.

Consulate Skygate seems like a start early blocker and when needed tap for Herald of Anguish, and drop Pia revolution for more lands

I would drop the Pia's Revolution for more land.Implement of combustion seems good, stops Copy Cat for 1 mana and it feeds your improvise. If you're playing Heart of Kiran, I would reccommend going all-in and playing more Planeswalkers.

Thanks for the comment to both of you! I agree with the idea to drop Pia's Revolution but instead of 2 lands I think to put 2 Cathar's Shield that are artifacts and cost 0.

Then I think to put 2 Implement of Combustion and one more copies of Tezzeret the Schemer instead of 1 Shock, Aethersphere Harvester and 1 Metallic Rebuke.

I find Consulate Skygate a good defender but not so good because it can crew nothing.. and I have already the Ornithopter that can't crew. In fact I use it for improvvise and for Tezzeret's Touch

Rereading the Implement I found that he do damage only to a player so it is useless against the cat.. so probably is better to have 3 Shock and 3 Cathar's Shield

It can deal 1 damage to a player, (or A certain Planeswalker that goes to 1 loyalty when it activates its minus)....

Yes that's true but Shock deals 2 damage so it's more aggressive... what do you do if you were me?

This deck is great! lol Tezzeret's Touch on vehicles is genius! Why didn't I think of that :). What I found pretty beast is Bastion Inventor+Stitcher's Graft+Cathar's Shield. Anyway could you take a look at my deck(U/B Improvise)? I think your feedback would be very insightful.

Hello! Thank you for your feedback!! I will go now to see your deck! I put the Bastion into Sideboard because I want to play the Herald so I don't want to have to choose between them. But your combo is very lethal!

It also makes control decks cry a little lol. No spot removal for you!