RE: One More Day Until the End of the Season

To be sure that you'll have the cards when the season ends, the most reliable, safe alternative is renting when the season end is in less than 23 hours: a rental can only be canceled by the card owner after 1 day, so you guarantee that you'll be with the card to receive the season rewards.

In theory you could rent when it's 23:59 minutes; I would give an extra 1-2 hours just to be sure in case the server borks and things get slow for a while.