Cheapest priced copy (Avatar: The Last Airbender Eternal): $1.79 at Card Kingdom, near mint, their price list as of .
Seismic Tutelage 
Enchantment — Aura · Rare · Avatar: The Last Airbender Eternal · #254
Enchant creature
When this Aura enters, put a +1/+1 counter on enchanted creature.
Whenever enchanted creature attacks, double the number of +1/+1 counters on it.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
1 printing · $1.79 to $1.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Avatar: The Last Airbender Eternal | 254 | Rare | $1.79 | $1.99 |