Cheapest priced copy (Avatar: The Last Airbender): $11.99 at Card Kingdom, near mint, their price list as of .
Planetarium of Wan Shi Tong 
Legendary Artifact · Mythic · Avatar: The Last Airbender · #259
{1}, {T}: Scry 2.
Whenever you scry or surveil, look at the top card of your library. You may cast that card without paying its mana cost. Do this only once each turn. (Look at the card after you scry or surveil.)
Legal inCommanderBrawlStandardPioneerModernLegacyVintage
Not legal inPauper
3 printings · $11.99 to $21.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Avatar: The Last Airbender Promos | 259s | Mythic | — | $21.99Out of stock |
| Avatar: The Last Airbender | 259 | Mythic | $11.99 | $11.99 |
| Avatar: The Last Airbender | 385 | Mythic | $15.99 | $14.99 |
4 rulings from Wizards of the Coast
- 2 October 2025You cannot choose to pay the mana cost or any alternate costs for the card if you choose to cast it, and if it has {X} in its mana cost, you must choose 0 as the value of {X}.
- 2 October 2025Once you choose to cast the top card of your library, Planetarium of Wan Shi Tong's ability won't trigger again that turn.
- 2 October 2025You must pay any mandatory additional costs (such as sacrificing a creature) and you may pay any optional additional costs (such as kicker) for the card you cast.
- 2 October 2025Planetarium of Wan Shi Tong's triggered ability allows you to cast the top card of your library during the resolution of the ability. It doesn't allow you to wait and cast the card later.