can i sac artifact creature to satisfy Drekavac?
can i sac artifact creature to satisfy Drekavac?
First of all, you don't sacrifice anything for Drekavac's triggered ability -- sacrifice refers to the act of sending a permanent from the battlefield to the graveyard.
But, to answer your question: a "noncreature card" is a card that does not have creature as one of its card types. Artifact creatures are, in fact, creatures; being an artifact also doesn't somehow negate the fact that it's a creature.
So, no, you cannot discard an artifact creature card for Drekavac's triggered ability, because by definition that is not a noncreature card.