Cheapest priced copy (Foundations Jumpstart): $0.99 at Card Kingdom, near mint, their price list as of .
Mu Yanling, Sky Dancer 
Legendary Planeswalker — Yanling · Mythic · Core Set 2020 Promos · #68p
+2: Until your next turn, up to one target creature gets -2/-0 and loses flying.
−3: Create a 4/4 blue Elemental Bird creature token with flying.
−8: You get an emblem with "Islands you control have '{T}: Draw a card.'"
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
4 printings · $0.99 to $18.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Foundations Jumpstart | 329 | Mythic | $0.99 | — |
| Core Set 2020 | 68 | Mythic | $0.99 | $7.99 |
| Core Set 2020 Promos | 68p | Mythic | $0.99 | $12.99 |
| Core Set 2020 Promos | 68s | Mythic | — | $18.99 |
5 rulings from Wizards of the Coast
- 12 July 2019In a multiplayer game, if you leave the game after Mu Yanling's first ability resolves but before your next turn begins, its effect lasts until your next turn would have begun. It neither expires immediately nor lasts indefinitely.
- 12 July 2019Tapping an Island for mana is an activated ability. You can't activate that ability and also activate the ability it gains from Mu Yanling's emblem.
- 12 July 2019Mu Yanling's first ability can target a creature that doesn't have flying. The creature just gets -2/-0.
- 12 July 2019An Island is a land with the subtype Island, not any land with a mana ability that produces blue mana.
- 12 July 2019After Mu Yanling's first ability has resolved, the target creature will have flying again if another effect grants it flying.