Scrapheap Nantuko

Scrapheap Nantuko enters the battlefield with
two +1/+1 counters on it.
Remove a +1/+1 counter from Scrapheap
Nantuko: Return target artifact to your hand
with converted mana cost equal to or less than
the amount of +1/+1 counters on Scrapheap
Nantuko.
{4}: Put a +1/+1 counter on Scrapheap Nantuko.