Delif's Cube

Artifact

, : This turn, when target creature you control attacks and isn't blocked, it assigns no combat damage this turn and you put a cube counter on this artifact.

, Remove a cube counter from this artifact: Regenerate target creature.

Illustrated by Mark Tedin

Delif's Cube is on the reserved list, which means WOTC has self-imposed restrictions from making functional reprints of this card.