Chimeric Mass enters the battlefield with X charge counters on it. {1}: Until end of turn, Chimeric Mass becomes a Construct artifact creature with "This creature's power and toughness are each equal to the number of charge counters on it."

Court Homunculus gets +1/+1 as long as you control another artifact.

Master of Etherium's power and toughness are each equal to the number of artifacts you control. Other artifact creatures you control get +1/+1.

Flying

Tap target creature. Metalcraft — If you control three or more artifacts, exile that creature.

({T}: Add {U}.)

({T}: Add {W}.)

Flash Flying If an opponent would search a library, that player searches the top four cards of that library instead.

Counter target instant spell.

When Portable Hole enters the battlefield, exile target nonland permanent an opponent controls with mana value 2 or less until Portable Hole leaves the battlefield.

Counter target noncreature spell unless its controller pays {2}.

Creatures entering the battlefield don't cause abilities to trigger.