This covers cards from the following sets:

Bloomburrow, Duskmourn, Foundations, Innistrad Remastered, Aetherdrift

Changes
InOutComments
Clockwork PercussionistFrenzied Goblin1MV 1/1's are getting better and this having the Artifact super type helps enable many strategies.
Galvanic BlastFire ProphecyIn this update there is a large uptick in incidental artifacts in the cube that it doesn't take a seer to see that turning metalcraft on is very easy. Since Volcanic Spite already exists in the cube, Fire Prophecy was the easy choice to cut.
Kuldotha RebirthGlimpse the ImpossibleThis card is a pauper staple and is only being added in due to the critical mass of artifacts in the cube. This replaces Glimpse the Unthinkable as most often times you'll be making tokens with this card rather than casting those spells the turn it is played.
Unholy HeatBorderland MarauderThis joins a cast of cards that were on the cusp of being added in due to the difficulty of enabling it's pay off was too difficult for its effect. The power of the cube has pushed an aggressive 3/2 out.
Gnawing CrescendoDynachargeMost often you're overloading to get a trumpet effect. This has a built in contingency plan where any surprises during the turn you're attempting to finish doesn't jsut leave you with an empty.
Heaped HarvestCloakwood SwarmkeeperA lot of value can be reaped from this card alone. It is easily splashable and enables many archetypes. This replaces Swarmkeeper as there's been a culling in token generation.
Monstrous EmergenceStruggle for SkemfarThis allows you to navigate around the biggest weakness of fight-based removal spells. No longer will you struggle to be open to two-for-one when your opponent removes your creature in response.
Avenging HunterStampeding Elk HerdInitiative is just too powerful.
Bushwhack-