Meticulous Sandstalker

Whenever Meticulous Sandstalker enters the battlefield or attacks, you may exile target card from a graveyard
Whenever Meticulous Sandstalker becomes blocked, you may untap it and remove it from combat
At the beginning of your end step, if there are no cards in an opponent's graveyard, put a +1/+1 counter on Meticulous Sandstalker