Tartaglia "Childe"

(Life can be paid with either {u} or 2 life)
You may have Tartaglia enter the battlefield as a
copy of any artifact or creature on the battlefield, except it's an artifact in addition to its other types
and gets a +1/+1 for each artifact on the
battlefield.
No. 11 of The Harbingers, also known as "Childe."
His name is highly feared on the battlefield.