its Op imo 6 of these and ur making 5 mutations that u can use with you aether qaunta just stall with 2 or 3 shields then u get a creat with atleast 10 attack 6 if unupped 3 of these. maybe a new fg killer?
Yeah, it could be OP. Very difficult to say, but I personally don't see it that OP. I think speed is one of the most important factors in an effective deck and this card is REALLY slow.
Sure you could chain Dimensional Shields (that's what I had in mind when making this card), but if your opponent can destroy them, or has Momentum, you are toast. Furthermore having a 10+|10+ mutant is not an automatic win.
I really like these kinds of cards because they make battles so much more exiting. "Omfg, the super mutant is coming, what do I do?!".