It's a very interesting card, indeed.
Being a Duo card maybe the cost should be reduced to 3/2. It seems to be hard to play with 4 cost
Seems reasonable to me.
Updated to have cost at 2
with activation costs of 2
/ 1
respectively (to mirror hourglass and mindgate upgrade scheme)
What happens, if the deck does not have creatures ?
Hmm... good point. I guess the easiest is to just have it do nothing for that player. Alternately I suppose it could produce some random creature...
I suppose if we're being really mean, it could spawn a singularity or cause autoloss.
Or maybe have it spawn random and have singularity be one of the possibilities.
Personally I think fizzle or random is best. Fizzle is easiest and simplest of course.