Dimensional Infiltrator

Devoid (This card has no color.)
Flash
Flying
{1}{C}: Target opponent exiles the top card of their library. If it's a land card, you may return this creature to its owner's hand. ({C} represents colorless mana.)

Oath of the Gatewatch

Devoid (This card has no color.)
Flash
Flying
{1}{C}: Target opponent exiles the top card of his or her library. If it's a land card, you may return Dimensional Infiltrator to its owner's hand. ({C} represents colorless mana.)

Oath of the Gatewatch Promos

You choose whether to return Dimensional Infiltrator to its owner’s hand as its ability resolves. If the exiled card is a land card, you can’t wait and return Dimensional Infiltrator at a later time.