Star-Crossed as reaction to Thrill of the Hunt?

Yes, you can play Star-Crossed as a reaction to Thrill of the Hunt.

Why this works:

1. Reaction Timing: Both Star-Crossed and Thrill of the Hunt have the [Reaction] keyword. Per Rule 813.1.c.1, this allows them to be played during Closed States (when the chain is not empty), such as in response to another spell.
2. Chain & Resolution: When you play Star-Crossed in response to Thrill of the Hunt, it is added to the top of the chain. Riftbound uses a Last-In, First-Out (LIFO) resolution order (Rule 340.1).

The Sequence:

1. Player A plays Thrill of the Hunt: It is placed on the chain.
2. Player B plays Star-Crossed: It is placed on top of Thrill of the Hunt.
3. Resolution:
   • Star-Crossed resolves first. It returns your chosen friendly unit and the chosen enemy unit to their owners' hands.
   • Thrill of the Hunt resolves next. If the unit it was targeting is no longer on the board (because it was returned to hand by Star-Crossed), the targeting relationship is severed (as per Rule 359.3.e.7 and the clarification on Alpha Strike targeting logic in the retrieved context), and Thrill of the Hunt will fail to execute its effect.

Important Note: As per RiftJudge FAQ #9452, you must have valid targets for Star-Crossed (a friendly unit and an enemy unit) present on the battlefield at the moment you play the card to initiate the spell. Once placed on the chain, if one target becomes unavailable, the spell proceeds to resolve using any remaining valid targets (Rule 359.3.e.8).