Possible Clues:

• Something unusual (perhaps worth collecting)
• One-off
• A one-in-a-million thing
• Once-in-a-blue-moon event
• In the light, dealer's ultimate object of quest!
• Very uncommon event
• Something unusual I try to change under artist
• Try air shot: you don’t often see that!
• Gunners side taking international trophy borders on strangeness
• I tarry in resort: that’s not seen often