For creatures that add abilities to instants and sorceries (like the new Pestilent Spirit or older Soulfire Grand Master), if one is on the battlefield, its controller casts an instant/sorcery, and while on the stack, the creature is removed from the battlefield, does the spell keep the ability, or if the creature is no longer on the battlefield on resolution, does it lose it? Thanks judge!
No, it won't.Pestilent Spirit's ability that grants deathtouch to your instants and sorceries is a static ability and so it only functions while Pestilent Spirit is on the battlefield. As soon as Pestilent Spirit dies, any instant or sorcery spells you control on the stack will no longer have deathtouch and just deal their damage as normal without the added effect. In other words, you need to control Pestilent Spirit when your spell resolves in order for the deathtouch ability to do anything.
