Un-sets tend to have a lot of Magic references, and Unfinity has shown it isn't an exception. Here's the set's mass pinger with a Riveteers Ascendancy refernce (which is itself a reference to an old photo) and the set's Animate Dead reference.
How does the black aura gain more than one sticker? Do the stickers stay on throughout the game, even if the card changes zones? And even then, you need some other card to recur it, right?
Many "put a sticker" let you target any nonland permanents, and while you'd rather use those effects to put an ability or P/T sticker on a creature those two also cost Tickets (which are similar to energy counters), so those Art/Name sticker payoffs are very useful since Art/Name stickers are free.
You COULD put a silly hat on your creature when you Visit Costume Shop (maybe to prevent a ping from Goblin Girder Gang), but an extra +2/+0 boost for free does sounds nice doesn't it?
And yes, stickers do stay attached anywhere but the hand and library, so unless you can reanimate enchantments, this won't be relevant for Last Voyage.