You seemed to miss a pretty big combo with this card, think about it then look in the spoiler if you haven't thought of it yet...
With this in mind, do any new creatures on your field after this is played also gain the buff? Overall, nice card idea, keep 'em coming (please).
Yeah, I'm aware. This also makes it an even stronger combo with Nymph's Tears, as
's Nymph can create Malignant Cells pretty easily if given a creature.
Yes, new creatures that come into play receive the buff, just like Nightfall/Eclipse
I really like the idea! Some questions about it: it says it give a buff of +2/+2 (or +3/+3) to your creatures, it is a permanent so does that mean your creatures get this buff at the end of every turn? Also, if the card is somehow destroyed will you be able to play creatures? And last but silly, it cant stuck with others right?
Anyway really good job, with 4 difficult cards.
Note: if yiu want correct your last sentence at notes(in decks suck as)
It's a constant buff to your field, like Nightfall as said above. It's only the perm that stops you from playing new creatures, so yeah if you or your opponent destroy it you can play creatures as you like, but you will also lose the buff. I intended it to be able to stack, and I think it should, though Malignant Cells could get kind of out of hand.