Oath of Ghouls

Enchantment

At the beginning of each player's upkeep, that player chooses target player whose graveyard has fewer creature cards in it than their graveyard does and is their opponent. The first player may return a creature card from their graveyard to their hand.

Oath of Ghouls is on the reserved list, which means WOTC has self-imposed restrictions from making functional reprints of this card.