Cheapest priced copy (Duel Decks: Mind vs. Might): $6.49 at Card Kingdom, near mint, their price list as of .
Desperate Ritual 
Instant — Arcane · Common · Champions of Kamigawa · #163
Add {R}{R}{R}.
Splice onto Arcane {1}{R} (As you cast an Arcane spell, you may reveal this card from your hand and pay its splice cost. If you do, add this card's effects to that spell.)
Legal inCommanderModernLegacyVintagePauper
Not legal inBrawlStandardPioneer
6 printings · $6.49 to $54.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Champions of Kamigawa | 163 | Common | $6.99 | $54.99Out of stock |
| Duel Decks: Mind vs. Might | 14 | Uncommon | $6.49 | — |
| Modern Masters | 110 | Uncommon | $6.49 | $19.99 |
| Secret Lair Drop | 1984 | Rare | $24.99 | $29.99 |
| Secret Lair Drop | 2706 | Rare | — | — |
| Ultimate Masters | 127 | Uncommon | $7.49 | $14.99 |
5 rulings from Wizards of the Coast
- 7 June 2013If all of the spell’s targets are illegal when the spell tries to resolve, it won’t resolve and none of its effects will happen.
- 7 June 2013A card with a splice ability can’t be spliced onto itself because the spell is on the stack (and not in your hand) when you reveal the cards you want to splice onto it.
- 7 June 2013You reveal all cards you intend to splice at the same time. Each individual card can be spliced only once onto any one spell.
- 7 June 2013You choose all targets for the spell after revealing cards you want to splice, including any targets required by the text of any of those cards. You may choose a different target for each instance of the word “target” on the resulting spell.
- 7 June 2013Desperate Ritual isn’t a mana ability. When cast, it (or the spell it’s spliced onto) goes on the stack like any spell and can be responded to.