Cheapest priced copy (Outlaws of Thunder Junction): $4.49 at Card Kingdom, near mint, their price list as of .
Kellan, the Kid 
Legendary Creature — Human Faerie Rogue · 3/3 · Mythic · Outlaws of Thunder Junction · #294
Flying, lifelink
Whenever you cast a spell from anywhere other than your hand, you may cast a permanent spell with equal or lesser mana value from your hand without paying its mana cost. If you don't, you may put a land card from your hand onto the battlefield.
Legal inCommanderBrawlStandardPioneerModernLegacyVintage
Not legal inPauper
4 printings · $3.99 to $12.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Outlaws of Thunder Junction | 213 | Mythic | $4.49 | $3.99 |
| Outlaws of Thunder Junction | 294 | Mythic | $6.49 | $12.99 |
| Outlaws of Thunder Junction Promos | 213p | Mythic | $4.49 | $7.99 |
| Outlaws of Thunder Junction Promos | 213s | Mythic | — | $6.99Out of stock |
6 rulings from Wizards of the Coast
- 12 April 2024Putting a land card onto the battlefield with Kellan’s last ability doesn’t count as playing a land. It can put a land card onto the battlefield even if you’ve already played your land for the turn.
- 12 April 2024If the permanent spell you cast has {X} in its mana cost, you must choose 0 as the value of X when casting it without paying its mana cost.
- 12 April 2024A permanent spell is an artifact, battle, creature, enchantment, or planeswalker spell.
- 12 April 2024If the spell you cast that caused Kellan, the Kid’s last ability to trigger is represented by a split card, the characteristics of the half you didn’t cast are ignored while that spell is on the stack. For example, if you cast the Cease half of Cease // Desist from the Murders at Karlov Manor release, that spell’s mana value is 2 because Cease’s mana cost is {1}{B}{G}.
- 12 April 2024If the spell you cast that caused Kellan, the Kid’s last ability to trigger has {X} in its mana cost, X is the value chosen as that spell was cast for the purpose of determining its mana value.
- 12 April 2024If you cast a spell “without paying its mana cost,” you can’t choose to cast it for any alternative costs. You can, however, pay additional costs, such as kicker costs. If the spell has any mandatory additional costs, those must be paid to cast the spell.