Temporal Aperture

Artifact, 2 (2)
{5}, {T}: Shuffle your library, then reveal the top card. Until end of turn, for as long as that card remains on top of your library, play with the top card of your library revealed and you may play that card without paying its mana cost. (If it has X in its mana cost, X is 0.)¹
Illus. Michael Sutfin

Gatherer Card Rulings [Nov 2009]

• 10/4/2004: While you do not have to pay the mana cost, you do have to pay any other costs described in the text that are paid when playnig the card. If the cost in the card text is optional, such as with Buyback, you can optionally pay that cost.
• 10/4/2004: If your library is shuffled or that card otherwise leaves the top of your library, the effect ends.
• 10/4/2004: The card is removed from the top of the library when you play it, just like a card is removed from your hand when you play it.

Format Legality	Legal in Vintage, Legacy Banned in Extended, Standard, MTGO Classic
Printings (1/6)	Urza's Saga (Rare)