Susurro de Horobi
Horobi's Whisper
If you control a Swamp, destroy target nonblack creature. Splice onto Arcane—Exile four cards from your graveyard. (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.)
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Reglas oficiales (5) · Scryfall
Horobi’s Whisper can target a creature even if you don’t control a Swamp, but the spell does nothing.
A 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.
You 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.
You reveal all cards you intend to splice at the same time. Each individual card can be spliced only once onto any one spell.
If 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.