Reki, the History of Kamigawa [Mystery Booster] Giant then you may return a

then you may return a creature card with mana value 2 or less from your graveyard to the battlefield

each player may top the high bid

Also …”

−4: Put target creature or planeswalker card from a graveyard onto the battlefield under your control

Grand Unifier enters the battlefield

Reki, the History of Kamigawa [Mystery Booster] Giant then you may return aSet: Mystery Booster Type: Legendary Creature Human Shaman Rarity: Rare Cost: {2}{G} Whenever you cast a legendary spell, draw a card. "After his death, monks spent ten years transcribing the tattoos from Reki's body and gathering stories from those who spoke with him. Thus the volume you hold was written." *The History of Kamigawa*