Q: If something is played where “your turn ends immediately,” does it mean that you are not subject to the hand and Keeper limits that turn?

A: No. Hand and Keeper Limits apply to you when it’s not your turn, so you would observe them as soon as your turn ends. Similarly, if you receive a card when it’s not your turn, you must observe the hand limit as soon as you get the card.

See: Q: What cards have effects that include ending my turn immediately if I play/use them?