Another small idea: A card that can stop the opponent's creature ability, perm ability for just one turn. Thinking about it, that might be a little OP but maybe give it a high cost, like 13+ or something. that way you could get past a strong shield for one turn, or maybe prevent your opp from loboing your oty or something.
this will be my last single card idea, i know a bunch of topics with just one idea could be annoying so i'll save up some ideas and post one large one.