Cheapest priced copy (Duel Decks: Elspeth vs. Kiora): $0.79 at Card Kingdom, near mint, their price list as of .
Aetherize 
Instant · Uncommon · The Lost Caverns of Ixalan Commander · #142
Return all attacking creatures to their owner's hand.
Legal inCommanderBrawlStandardPioneerModernLegacyVintage
Not legal inPauper
15 printings · $0.79 to $39.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Warhammer 40,000 Commander | 191 | Uncommon | $1.29 | — |
| Warhammer 40,000 Commander | 191★ | Uncommon | — | — |
| Bloomburrow Commander | 161 | Uncommon | $0.99 | — |
| Commander 2015 | 85 | Uncommon | $1.29 | — |
| Duel Decks: Elspeth vs. Kiora | 36 | Uncommon | $0.79 | — |
| Foundations Commander | 59 | Uncommon | $0.99 | — |
| Foundations | 151 | Uncommon | $0.99 | $1.49 |
| Gatecrash | 29 | Uncommon | $0.79 | $5.99 |
| Iconic Masters | 40 | Uncommon | $0.99 | $2.99 |
| The Lost Caverns of Ixalan Commander | 142 | Uncommon | $0.99 | — |
| The List | DDO-36 | Uncommon | $0.99 | — |
| Ravnica Remastered | 448 | Uncommon | $5.99 | $11.99 |
| Starter Commander Decks | 42 | Uncommon | $0.79 | — |
| Secret Lair Drop | 1667 | Rare | $32.99 | $39.99 |
| Zendikar Rising Commander | 23 | Uncommon | $0.99 | — |
One ruling from Wizards of the Coast
- 17 November 2017An "attacking creature" is one that has been declared as an attacker this combat, or one that was put onto the battlefield attacking this combat. Unless that creature leaves combat, it continues to be an attacking creature through the end of combat step, even if the player it was attacking has left the game, or the planeswalker it was attacking has left combat. There's no such thing as an attacking creature outside of the combat phase.