4 Oct 2019
Covetous Urge's effect doesn't change when you can cast the exiled card. For example, if you exile a sorcery card, you can cast it only during your main phase when the stack is empty.
4 Oct 2019
If you cast an Adventure with Covetous Urge, it's you, not the card's owner, who may cast the creature later.
4 Oct 2019
In a multiplayer game, if a player leaves the game, all cards that player owns leave as well. If you leave the game, the spell or permanent you control from Covetous Urge's effect is exiled.
4 Oct 2019
Casting an exiled card causes it to leave exile. You can't cast it multiple times.