Desperate Ritual
Instant — Arcane
Oracle Text
Add
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Splice onto Arcane 
(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.)
Rules for this card
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A keyword ability that lets a player add a card’s rules text onto another spell. See rule 702.47, “Splice.”
Rulings (5)
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Wizards of the CoastIf 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.
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Wizards of the CoastA 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.
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Wizards of the CoastYou reveal all cards you intend to splice at the same time. Each individual card can be spliced only once onto any one spell.
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Wizards of the CoastYou 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.
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Wizards of the CoastDesperate 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.