Cheapest priced copy (The Lost Caverns of Ixalan Commander): $0.49 at Card Kingdom, near mint, their price list as of .
Thieving Skydiver 
Creature — Merfolk Rogue · 2/1 · Rare · Zendikar Rising · #85
Kicker {X}. X can't be 0. (You may pay an additional {X} as you cast this spell.)
Flying
When this creature enters, if it was kicked, gain control of target artifact with mana value X or less. If that artifact is an Equipment, attach it to this creature.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
6 printings · $0.49 to $2.79 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| The Lost Caverns of Ixalan Commander | 177 | Rare | $0.49 | — |
| Outlaws of Thunder Junction Commander | 118 | Rare | $0.49 | — |
| Zendikar Rising Promos | 85p | Rare | $0.49 | $2.49 |
| Zendikar Rising Promos | 85s | Rare | — | $2.79 |
| Zendikar Rising | 85 | Rare | $0.49 | $0.99 |
| Zendikar Rising | 335 | Rare | $1.49 | $1.49 |
9 rulings from Wizards of the Coast
- 25 September 2020Thieving Skydiver's ability can target an artifact you already control. You'll attach it to Thieving Skydiver if it's an Equipment.
- 25 September 2020The control-change effect of Thieving Skydiver lasts indefinitely. It doesn't wear off during the cleanup step, and it doesn't expire if Thieving Skydiver leaves the battlefield. In a multiplayer game, it does expire if you leave the game.
- 25 September 2020If the Equipment can't be attached to Thieving Skydiver, most likely because Thieving Skydiver has left the battlefield before its triggered ability resolves, the Equipment remains attached to whatever it's currently attached to or remains unattached if attached to nothing.
- 8 November 2024If a spell's kicker cost was paid, the spell is "kicked."
- 8 November 2024The kicker ability doesn't let you pay a kicker cost more than once.
- 8 November 2024To determine a spell's total cost, start with the mana cost (or an alternative cost if another card's effect allows you to pay one instead), add any cost increases (such as kicker), then apply any cost reductions. The spell's mana value remains unchanged, no matter what the total cost to cast it was.
- 8 November 2024If you put a permanent with a kicker ability onto the battlefield without casting it, you can't kick it.
- 8 November 2024If you copy a kicked spell on the stack, the copy is also kicked. If the copied spell is a permanent spell, the token the copy of that spell becomes when it enters is also kicked.
- 8 November 2024If a card or token enters as a copy of a permanent, the new permanent isn't kicked, even if the original was.