What happens if my hand runs out of cards?

In Riftbound, there is no penalty or specific game action triggered simply by having an empty hand. You may continue to play the game normally, drawing cards during your draw phase or through card effects as usual.

According to the rules, your hand is simply a zone (Rule 107.6) from which you play cards. If you have no cards in your hand, you are simply unable to play cards from that zone until you draw more.

Additionally, if you are instructed to discard cards while your hand is empty, you follow the "Do as much as you can" (DAMAYC) rule: you discard nothing and continue with the rest of the effect. As noted in the related FAQs:

• Discarding: "When a card instructs you to discard but you have no cards in hand, you do as much as you can and then continue with the rest of the effect."
• Playing cards with discard costs: You are permitted to play a card that requires a discard even if your hand is empty; you simply discard zero cards and resolve the remainder of the card's effect.