Cheapest priced copy (The Lost Caverns of Ixalan Commander): $0.99 at Card Kingdom, near mint, their price list as of .
Admiral Beckett Brass 
Legendary Creature — Human Pirate · 3/3 · Mythic · Ixalan · #217
Other Pirates you control get +1/+1.
At the beginning of your end step, gain control of target nonland permanent controlled by a player who was dealt combat damage by three or more Pirates this turn.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
7 printings · $0.99 to $13.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| The Lost Caverns of Ixalan Commander | 264 | Mythic | $0.99 | — |
| The List | XLN-217 | Mythic | $0.99 | — |
| Ixalan Promos | 217s | Mythic | — | $4.99 |
| Secret Lair Drop | 1410 | Mythic | $3.99 | — |
| Secret Lair Drop | 1410★ | Mythic | — | $4.99 |
| Secret Lair Drop (Edward, Jackdaw Captain) | 1561 | Mythic | $9.49 | $13.99 |
| Ixalan | 217 | Mythic | $0.99 | $2.99 |
6 rulings from Wizards of the Coast
- 29 September 2017The control-change effect of Admiral Beckett Brass's triggered ability lasts indefinitely. It doesn't wear off during the cleanup step or when you lose control of Admiral Beckett Brass.
- 29 September 2017If more than one player was dealt combat damage by three Pirates, you target only one permanent. It may be controlled by either of those players.
- 29 September 2017If one Pirate deals combat damage multiple times, most likely because it has double strike, it counts as only one of the three Pirates for Admiral Beckett Brass's triggered ability.
- 29 September 2017In a multiplayer game, if a player leaves the game, all cards that player owns leave as well, and any effects that give the player control of permanents immediately end.
- 29 September 2017Admiral Beckett Brass's triggered ability checks what happened earlier in the turn. It doesn't care whether Admiral Beckett Brass was on the battlefield when those Pirates dealt combat damage, whether those creatures are still on the battlefield, or whether they're still Pirates.
- 29 September 2017In a Two-Headed Giant game, combat damage dealt by Pirates your teammate controls will count when checking for Admiral Beckett Brass's ability.