Outsider's Timepiece

From the past... {t}{w}{b}: Play a Sorcery card from your graveyard to the battlefield, at no cost, then exile it.

...to the present... {t}{w}{w}: Play an Artifact card
from your graveyard to battlefield, at no cost.

...there may be another way. {t}{b}{b}: Play a creature from your graveyard to the battlefield, at no cost. If it's destroyed it can't be regenerated.