Scrapyard Sentinel

Vigilance
When Scrapyard Sentinel enters the battlefield,
you may exile target artifact card from a
graveyard. If you do, put a +1/+1 counter on Scrapyard Sentinel.
Whenever Scrapyard Sentinel attacks, you may
tap target artifact creature defending player
controls. If you do, Scrapyard Sentinel gains indestructible until end of turn.