What if Warlords bloodlust gave spellvamp

Well, Morde isn't much of an abuse case, and Vlad is getting reworked.

Morde can't abuse that at all. His Q is counted as 'AoE', so you only heal for a third of its damage and the lifesteal is only applied to the basic attacks damage, not the bonus from the Q... so since his E and W do negligible damage plus his R already heals you for the damage it does, you're not really gaining much on him.

Vlad gaining 10% at 20% health wouldn't really be much either. His Q would heal him for 10% of the damage it deals and his E and R would heal for 3.33%. Not... really much. Shrug WotA works because it does 15% pre-resists and his E amiplifies that quite nicely.