I will give this a 4 out of 5 for the overall quality of this set
Along with Shift, Diablo has the Evasive keyword, which means that he can be challenged only if the opposing character has the same keyword
If an opponent chooses that card for any purpose, it's discarded straight away
I should point out that theres another card for Terra in the main Final Fantasy set which places much more emphasis on this aspect of her character, actually transforming into a Saga Creature like the other summon/esper cards and having special synergy with them
Then, once you have enough characters out, youll start turning everything sideways
Firstly, while characters are located in the Pride Lands, they gain +2 Resist, meaning that in challenges they will avoid those two points of damage