Cheapest priced copy (Secrets of Strixhaven Commander): $0.49 at Card Kingdom, near mint, their price list as of .
Entrancing Melody 
Sorcery · Rare · Ixalan Promos · #55p
Gain control of target creature with mana value X.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
4 printings · $0.49 to $4.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Ixalan Promos | 55p | Rare | $0.99 | $4.99 |
| Ixalan Promos | 55s | Rare | — | $0.99 |
| Secrets of Strixhaven Commander | 196 | Rare | $0.49 | — |
| Ixalan | 55 | Rare | $0.49 | $0.99 |
3 rulings from Wizards of the Coast
- 29 September 2017If a permanent has {X} in its mana cost, X is considered to be 0.
- 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 2017The control-change effect of Entrancing Melody lasts indefinitely. It doesn't wear off during the cleanup step.