Cheapest priced copy (Outlaws of Thunder Junction): $0.49 at Card Kingdom, near mint, their price list as of .
Lilah, Undefeated Slickshot 
Legendary Creature — Human Rogue · 3/3 · Rare · Outlaws of Thunder Junction · #356
Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)
Whenever you cast a multicolored instant or sorcery spell from your hand, exile that spell instead of putting it into your graveyard as it resolves. If you do, it becomes plotted. (You may cast it as a sorcery on a later turn without paying its mana cost.)
Legal inCommanderBrawlStandardPioneerModernLegacyVintage
Not legal inPauper
4 printings · $0.49 to $1.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Outlaws of Thunder Junction | 217 | Rare | $0.49 | $0.49 |
| Outlaws of Thunder Junction | 356 | Rare | $0.99 | $0.99 |
| Outlaws of Thunder Junction Promos | 217p | Rare | $0.49 | $0.79 |
| Outlaws of Thunder Junction Promos | 217s | Rare | — | $1.99 |
8 rulings from Wizards of the Coast
- 12 April 2024Plot abilities are written "Plot [cost]," which means "Any time you have priority during your main phase while the stack is empty, you may pay [cost] and exile this card from your hand. It becomes plotted."
- 12 April 2024You can't cast a plotted card on the same turn it became plotted. On any future turn, you may cast that card from exile without paying its mana cost during your main phase while the stack is empty.
- 12 April 2024If a spell is countered or it never resolves, Lilah, Undefeated Slickshot will not exile it.
- 12 April 2024The spell will have all its normal effects before being exiled. If the spell's normal effects include exiling itself, Lilah's effect won't apply to it and it won't become plotted.
- 12 April 2024Exiling a card using its plot ability is a special action. Once you announce you're taking that action, no other player can respond by trying to remove that card from your hand.
- 12 April 2024If a plotted card 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 2024If you're casting a plotted card from exile without paying its mana cost, you can't choose to cast it for any other alternative costs. You can, however, pay additional costs, such as kicker costs. If the plotted card has any mandatory additional costs, those must still be paid to cast the spell.
- 7 June 2024If an instant or a card with flash is plotted this way, you can still cast it only when you have priority during your main phase while the stack is empty.