Can you play 2 reaction spells on your opponent's turn in reaction to something?

Yes, you can play two (or more) reaction spells on your opponent's turn in reaction to something.

According to the Riftbound FAQ #10041, you can chain multiple reaction spells together before passing priority back to your opponent. Because you retain priority after playing a reaction spell, you are not forced to pass immediately, allowing you to add more reactions to the chain.

How it works:

1. Chain Initiation: Your opponent plays a card or activates an ability that uses the chain (initiating a Closed State).
2. Your Response: You play your first reaction spell.
   • Chain State: [Opponent's Action] → [Your Reaction 1]
3. Retaining Priority: Instead of passing priority back to your opponent, you play your second reaction spell.
   • Chain State: [Opponent's Action] → [Your Reaction 1] → [Your Reaction 2]
4. Passing Priority: Once you are finished adding your reactions, you pass priority to your opponent. If they pass back, the chain begins to resolve.
5. Resolution (LIFO): The chain resolves in Last-In, First-Out (LIFO) order:
   • Your Reaction 2 resolves first.
   • Your Reaction 1 resolves second.
   • The opponent's original action resolves last (unless it was countered by one of your reactions).

Important Notes:

• Reaction Keyword: Only cards (or abilities) with the Reaction keyword can be played during a Closed State (Rule 309.1.a).
• No Reactions to Units: As noted in Riftbound FAQ #5909 and #7795, you cannot respond to an opponent simply playing a unit from their hand, as units do not linger on the chain. You can only react to the unit's triggered abilities after it enters the battlefield.