Magic: The Gathering

Daniels, Temporal Agent [Star Trek]

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Set:	Star Trek
Type:	Legendary Creature — Human Advisor
Rarity:	Uncommon
Cost:	{2}{B/G}{B/G}

When Daniels enters, return target creature card from your graveyard to your hand.
{2}, Put this card from your graveyard on the bottom of your library: You gain 2 life.

You're thinking of time travel like we're in some H.G. Wells novel. We're not. It's far more complicated.