Horobi's Whisper

Instant - Arcane, 1BB (3)
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.)¹
Illus. Aleksi Briclot

Gatherer Card Rulings [Nov 2009]

• 2/1/2005: Horobi's Whisper can target a creature even if you don't control a Swamp, but the spell does nothing.

Format Legality	Legal in Vintage, Legacy, Extended Banned in Standard
Printings (1/8)	Betrayers of Kamigawa (Common)