Torrn, Scrapheap Apex

Torrn, Scrapheap Apex enters the battlefield with
three +1/+1 counters on it.
{2}, Sacrifice an artifact or creature: put a +1/+1 counter on Torrn, Scrapheap Apex
Remove three +1/+1 counter from Torrn: Search
your library and/or graveyard for an artifact card
and put it into your hand. If you search your
library this way, shuffle it.