73 - Skin to Vines - Debuff that changes the caster's target to Bodytype plant - Mana: 300, +FRspelldmg%: 3/5/7, +SlashingDmg%: 3/5/7 - 2.5sec cast, 3min duration, Max Level 75
I'm going to go out on a limb and say we'll never see a similar spell that changes mobs into undead-flagged, but the new Druid spell (even if it doesn't actually make it live) shows that it is possible