You need to make the cards non offensive, non healing utility. Something like old ewer is totally fine for this, old bole is as well because while you aren’t going to play a tanks defensives around it 20% mitigation on the tank isn’t ever going to go astray. I don’t really like encroaching on SCH’s niche but a card that generates peleton is another one. A card that refreshes CD’s of non damage abilities could be another one. A card that generates a movement ability could be one

I’m just spitballing ideas here but what the cards need to be is all utility where interesting use of what card you get is how you differentiate yourself from others