Cheapest priced copy (Midnight Hunt Commander): $1.99 at Card Kingdom, near mint, their price list as of .
Aetherspouts 
Instant · Rare · Magic 2015 · #44
For each attacking creature, its owner puts it on their choice of the top or bottom of their library.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
3 printings · $1.99 to $9.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Commander 2021 | 114 | Rare | $2.29 | — |
| Magic 2015 | 44 | Rare | $2.29 | $9.99 |
| Midnight Hunt Commander | 97 | Rare | $1.99 | — |
2 rulings from Wizards of the Coast
- 18 July 2014If an effect puts two or more cards on the top or bottom of a library at the same time, the owner of those cards may arrange them in any order. That library's owner doesn't reveal the order in which the cards go into their library.
- 18 July 2014The owner of each attacking creature chooses whether to put it on the top or bottom of their library. The active player (the player whose turn it is) makes all of their choices first, followed by each other player in turn order.