Xantus, Mechanical Tyrant

Whenever an artifact enters the battlefield under
your control, create a 1/1 colorless Mechanite
creature token.
When Xantus, Mechanical Tyrant dies,
create X 1/1 colorless Mechanite creature
tokens where X is equal to half the
number of +1/+1 counters on it.
{p/c}: Sacrifice an artifact: Put a +1/+1
counter on Xantus, Mechanical Tyrant and
draw a card.