@Lazrbeams
Actually Death Wish was used as the primary replacement after the restriction of Burning Wish (now lifted). The derivatives of Burning Long were referred to as GrimLong or DeathLong, relying on Grim Tutor and Death Wish to find the then-recently-restricted Lion's Eye Diamond.

The main reason for using Burning Wish over Death Wish is the mana cost. Since your wishboard is made up of sorceries anyway, and you can often be wishing two to four times per turn during your combo, the extra mana you save over Death Wish can be used to casting your other business spells, such as Yawgmoth's Will, Tendrils of Agony, or more Burning Wishes to find them. Death Wish also severely restricts the number of cards you can draw with Necropotence/autoc... (see all)