Strategies:Effect Mixing

If you mix two or more effects that apply to the same request, it can boost the request's price (sometimes). Below is a list of most of my reccommendations for these combos.
List of combos
Request 	Primary effect (III)	Secondary effect (II)
Lock is not working! 	Acid 	Explosion
I've been cursed, can you lift it? 	Luck 	Anti-Magic
Coat my weapon in something dangerous. 	Lightning 	Fire
Something throwable for lots of damage. 	Acid 	Lightning
Protection from different damage types. 	Anti-Magic 	Lightning Protection
I want my crops to be big. 	Enlargement 	Wild Growth
Increase my combat stats. 	Swiftness 	Dexterity
Something to help in the bedroom. 	Libido 	Charm
My neighbor's house burned down, I don't
want that to happen to me!	Lightning Protection	Fire Protection
Could you give me some sort of sleep draught?	Sleep 	Healing
I need a sort of recovery potion. 	Mana 	Healing