As the game works mostly in absolute values, it should be like 1 or 2 quanta less, and 1 or 2 quanta more, instead of 10%|20%
But regarding other options, I think it should be some kind of high cost ultimate card, something like "drain all your quanta" while having a massive quanta drain just to be in the field, or it would be OP...
I think some kind of growth hability would be cool, something like "every creature gains +1|+1 every turn", and make it like a 12 quanta draining permanent... Also make it kill every creature in the field when it is destroyed, ore some kind of nerf like that