U/R Artifact HUGE FNM 3-1

so i played this deck at my fnm in dallas and there was a 175 contestants and i went 3-1 with this deck and besides the last game, i wrecked shop and my opponents never had an answer for this deck. i can consistently win by turn 4 or 5. i ended playing at the top 8 table at the end which was definitely been a first with this brew i have made. first game i played a green devotion deck and i just destroyed him 2-0, second match played g b constellation deck and went 2-0 against him, the card shrapnel blast is a way overpowered card with doom engine, third game i played jeskai and went 2-1, and i would say i only lost the second match due to mana issues, then the fourth game i lost 1-2 to g devotion, 2nd match i got him down to 12 with two shrapnel blast in my hand but i could never get his life total low enough, and the third match i got mana flooded and couldnt deal with his big creatures i would argue this a very competitive deck and needs to looked at with the meta being slower decks. i dont know what i would change, may take out the keranos for an extra burn possibly, i would need to make my sideboard better but you know, it did quiet well for me and void snare won me 2 matches bouncing his big creature back to his hand slowing my opponent down a turn. i will say one creature that really hurt me was courser of kruphix and i may need to play stoke the flames for that card.