Exile target nonland permanent. For as long as that card remains exiled, its owner may play it. A spell cast by an opponent this way costs more to cast.
Teferi's body couldn't travel through time far enough, but with Kaya's help, his spirit could.
Playing the exiled card follows all normal timing rules for a card of that type, and its owner must pay all costs (including the additional {2} if applicable) to cast it this way.
Random a card of Magic: The Gathering (MTG), but you can also roll the D20 dice, random a Planeswalker, have fun with the random rules and more.