Cayde's Stash is the daily today! It has quite a bit of Easter Eggs inside! The cards, Master Chief, and probably some more stuff. I feel like this could be a Black Spindle... I can feel it!
Once you go into his secret room and scan the card, go back across the bridge and see if you can scan the other card. I have a strong feeling that this could be a great day for Secret Hunters! Report back with your discoveries!