Cheapest priced copy (Avatar: The Last Airbender): $0.49 at Card Kingdom, near mint, their price list as of .
Ty Lee, Chi Blocker 
Legendary Creature — Human Performer Ally · 2/1 · Rare · Avatar: The Last Airbender · #76
Flash
Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)
When Ty Lee enters, tap up to one target creature. It doesn't untap during its controller's untap step for as long as you control Ty Lee.
Legal inCommanderBrawlStandardPioneerModernLegacyVintage
Not legal inPauper
3 printings · $0.49 to $5.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Avatar: The Last Airbender Promos | 76s | Rare | — | $5.99 |
| Avatar: The Last Airbender | 76 | Rare | $0.49 | $0.79 |
| Avatar: The Last Airbender | 371 | Rare | $2.29 | $1.99 |
3 rulings from Wizards of the Coast
- 2 October 2025If Ty Lee, Chi Blocker leaves the battlefield, you no longer control her, and her effect ends.
- 2 October 2025If another player gains control of Ty Lee, Chi Blocker, her effect ends. Regaining control of Ty Lee, Chi Blocker won't cause the effect to resume.
- 2 October 2025If Ty Lee, Chi Blocker ceases to be under your control before its ability resolves, you will still tap the targeted creature, but it will untap normally during its controller's next untap step.