This Rare card is numbered 29/115 in the set
Kroxa, Titan of Death's Hunger Between tons of cheap interaction, cantrips, and fetch lands, you'll have no trouble getting enough cards in the graveyard to escape Kroxa, Titan of Death's Hunger
Without Utopic Zexal, that's a harder ask - though, honestly, that's probably for the best
Having been influenced by Cube content on Channel Fireball that may be familiar to a few of you, Gravecrawler was one of a handful of cards I broke singleton for, as it emphasized a combination of themes that I was eager for -- the 'Crawler made recursive graveyard decks shine, it was a favorite card to sacrifice, it helped me integrate aggro into black (which was somewhat supported in all five colors at the time, a silly approach but an approach all the same) -- it was the kind of card I played Cube to see shine