Cheapest priced copy (Foundations): $0.49 at Card Kingdom, near mint, their price list as of .
Kellan, Planar Trailblazer 
Legendary Creature — Human Faerie Scout · 2/1 · Rare · Foundations · #330
{1}{R}: If Kellan is a Scout, it becomes a Human Faerie Detective and gains "Whenever Kellan deals combat damage to a player, exile the top card of your library. You may play that card this turn."
{2}{R}: If Kellan is a Detective, it becomes a 3/2 Human Faerie Rogue and gains double strike.
Legal inCommanderBrawlStandardPioneerModernLegacyVintage
Not legal inPauper
5 printings · $0.49 to $6.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Foundations | 91 | Rare | $0.49 | $0.49 |
| Foundations | 330 | Rare | $0.49 | $1.49 |
| Foundations | 392 | Rare | — | $6.99Out of stock |
| Foundations | 466 | Rare | $0.49 | $0.49 |
| Foundations Promos | 91s | Rare | — | $0.49 |
4 rulings from Wizards of the Coast
- 8 November 2024The effects from Kellan's abilities overwrite other effects that set power and/or toughness if and only if those effects existed before the ability resolved. They will not overwrite effects that modify power or toughness without setting it (whether from a static ability, counters, or a resolved spell or ability), nor will they overwrite effects that set power and toughness which come into existence after they resolve. Effects that switch the creature's power and toughness are always applied after any other power or toughness changing effects, including these two, regardless of the order in which they are created.
- 8 November 2024Neither of these abilities have durations. If one of them resolves, it will remain in effect until the game ends, Kellan leaves the battlefield, or some subsequent effect changes its characteristics, whichever comes first.
- 8 November 2024Kellan's abilities overwrite its existing creature types. For example, once Kellan's first ability resolves, if he was a Scout when it resolved, Kellan will be a Human Faerie Detective. He won't have the Scout creature type.
- 8 November 2024You can activate Kellan's abilities regardless of what creature types he currently has. Each ability checks Kellan's creature types when it resolves. If Kellan doesn't have the appropriate creature type at that time, the ability will do nothing.