Cheapest priced copy (The List): $5.99 at Card Kingdom, near mint, their price list as of .
Cabal Therapy 
Sorcery · Uncommon · World Championship Decks 2003 · #pk62
Choose a nonland card name. Target player reveals their hand and discards all cards with that name.
Flashback—Sacrifice a creature. (You may cast this card from your graveyard for its flashback cost. Then exile it.)
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
8 printings · $5.99 to $329.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Eternal Masters | 83 | Uncommon | $6.99 | $10.99 |
| Friday Night Magic 2005 | 5 | Rare | — | $44.99 |
| Judgment | 62 | Uncommon | $21.99 | $329.99 |
| Premium Deck Series: Graveborn | 12 | Uncommon | — | $8.49 |
| The List | EMA-83 | Uncommon | $5.99 | — |
| World Championship Decks 2003 | pk62 | Uncommon | $14.99 | — |
| World Championship Decks 2003 | pk62sb | Uncommon | $10.99 | — |
| World Championship Decks 2003 | we62sb | Uncommon | $12.99 | — |
7 rulings from Wizards of the Coast
- 8 June 2016You name the card as Cabal Therapy resolves, not as you cast it. Then the targeted player reveals their hand and discards if appropriate. No player may choose to take actions between you naming the card and the targeted player revealing and discarding.
- 19 March 2021You must still follow any timing restrictions and permissions, including those based on the card’s type. For instance, you can cast a sorcery using flashback only when you could normally cast a sorcery.
- 19 March 2021“Flashback [cost]” means “You may cast this card from your graveyard by paying [cost] rather than paying its mana cost” and “If the flashback cost was paid, exile this card instead of putting it anywhere else any time it would leave the stack.”
- 19 March 2021You can cast a spell using flashback even if it was somehow put into your graveyard without having been cast.
- 19 March 2021To determine the total cost of a spell, start with the mana cost or alternative cost (such as a flashback cost) you’re paying, add any cost increases, then apply any cost reductions. The mana value of the spell is determined only by its mana cost, no matter what the total cost to cast the spell was.
- 19 March 2021A spell cast using flashback will always be exiled afterward, whether it resolves, is countered, or leaves the stack in some other way.
- 19 March 2021If a card with flashback is put into your graveyard during your turn, you can cast it if it’s legal to do so before any other player can take any actions.