Bairn, Scholar of Mechanus

Bairn, Scholar of Mechanus enters the battlefield
with X +1/+1 counters on it.
{t} Remove X +1/+1 counters from Bairn, search
you library for an artifact card with mana value
equal to or less then the amount of counters
removed this way. Reveal it, you may put it onto
the battlefield without paying its mana cost.
Shuffle you library.