I don't see why every dislikes the Malignant Cells, they have won me so many matches before against L5's and a couple of gods, as long as you have steal, you are hitting 25 damage every turn. (i think that's the max amount of creatures aloud on the field)
And not to mention the other creatures you already had on the field. I kind of like them, and it's always used on me, I never use it myself.