If Dazzling Aurora triggers and gives Kadregrin, who draws a reaction spell with his ability, can that reaction spell be played before the turn ends and marked damage fades?

Ruling: No, the reaction spell cannot be played before the turn ends. After Kadregrin's when-you-play-me (WYPM) ability resolves from the chain, there is no additional priority window before the turn ends.

Sequence:

• Dazzling Aurora triggers and resolves, putting Kadregrin into play
• Kadregrin goes onto the chain and auto-resolves
• Kadregrin's WYPM ability goes onto the chain
• Players can react to the WYPM ability if they want
• The WYPM ability resolves (drawing the card)
• No further priority is given after this chain closes
• Turn ends and marked damage fades

Nuances:

• If there was a second Aurora trigger after Kadregrin (chain: Aurora > Aurora), and the first Aurora brought in Kadregrin, then the owner of the second Aurora would get priority once Kadregrin's WYPM eventually resolves, allowing the reaction spell to be played in response to that second Aurora