Shroud

Shroud, Pshaw! Sure Shroud makes sense for "Can't be target of spells and abilities" some of the time. Alexi's Cloak, Sure. Wispersilk Cloak, Okay. They are shrouded can't be be seen by some magical means hidden from plain view ergo you can't target them, but there are a slew of other reasons why things can't be targeted. Maybe you can see it but it's guarded. Maybe you can see it but you can't figure out where to hit it with the spell. There's also the case of Zephid where spells just don't like him. You know what's a great keyword that would mean "Can't be target of spells and abilities" ? UNTARGETABLE !!!