for shadow / astral you could have a card that disables a card for the other person *the person you are vsing* say if you are first you pull the card you could cast the spell disable what they are doing for 5 turns for example you disable all dispels so they cannot dispel spam another example heals you disable their heal it disables healing for 5 turns *pets can still heal* pretty much thats the idea also if you disable blades they cannot cast blades *this does not work on hits* *can disable juju too*
It would have to be 1 shadow pip so it cant be spamed
i've had battles where first 2 rounds, i had both shadows, second i casted shrike i got another shadow....so i mean if your lucky, even with it costing shadow, if your percentage is hiigh enough, ya can spam it