Cheapest priced copy (Avatar: The Last Airbender Eternal): $0.49 at Card Kingdom, near mint, their price list as of .
Master's Guidance 
Enchantment · Rare · Avatar: The Last Airbender Eternal · #206
Whenever you attack with two or more legendary creatures, put a +1/+1 counter on each of up to two target attacking creatures.
At the beginning of your end step, if you control a creature with power 4 or greater, draw a card.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
2 printings · $0.49 to $0.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Avatar: The Last Airbender Eternal | 141 | Rare | $0.49 | $0.49 |
| Avatar: The Last Airbender Eternal | 206 | Rare | $0.99 | $0.49 |
2 rulings from Wizards of the Coast
- 2 October 2025Master's Guidance's first ability can put a +1/+1 counter on each of any two attacking creatures, not just on the legendary attacking creatures that caused it to trigger.
- 2 October 2025Creatures that enter the battlefield attacking will not trigger Master's Guidance's first triggered ability. You have to declare two or more legendary creatures as attackers during your declare attackers step to trigger the ability.