I felt so excited about this one I actually downloaded gimp and stuff wanting to mock it up.. but I couldn't find a night card template.
EDIT: A kind person helped me out. It's humongous because I'm still an image noob, but I think the art is perfect.
Mr. Cotton2$ Treasure - Night - Heirloom - Companion
Worth 1$
If it's night, set this aside and play it at the beginning of your next buy phase.
Lady Redtail2$ Treasure - Night - Heirloom - Companion
Worth 1$
If it's night, set this aside and play it at the beginning of your next buy phase.
Miss Spots2$ Treasure - Night - Heirloom - Companion
Worth 1$
If it's night, set this aside and play it at the beginning of your next buy phase.
Sparklemane2$ Treasure - Night - Heirloom - Companion
Worth 1$
If it's night, set this aside and play it at the beginning of your next buy phase.
Master Brownfeathers2$ Treasure - Night - Heirloom - Companion
Worth 1$
If it's night, set this aside and play it at the beginning of your next buy phase.
Queen Silktrunk2$ Treasure - Night - Heirloom - Companion
Worth 1$
If it's night, set this aside and play it at the beginning of your next buy phase.
Keep in mind that like Outpost, the card will stay in play during the turn it generated rather than scheduling the turn to occur then bailing out. This intuition is a little trickier when the duration is already overstaying its welcome by Seaside's standards, just like Archive and Crypt do, so I almost thought I needed rider text for that but I don't. I think this was actually achievable with startlingly little exception text, especially now that we have Mission making the "nobody play the Islands+Mountains+Time Warp MtG tournament deck in Dominion pls" exception text familiar.
I think initially some people might think this seems so so powerful and that it needs to cost more but I really don't think so. But I think even if it does, like Outpost it has a way of shouldering its way into a niche even it feels like the cost was rounded up to the nearest $, because it provides a pseudo +buy (and in both cases, it is a pseudo +buy with the potential to reach Duchy - no one gets Explorer because they can build a powerful deck that would be capable of buying Dominates and that pseudo + buy is the little bit extra)