This card is UP. You block one artifact space to hold up one creature space.
You got fewer artifact spaces, so meh.
What about making the blockage
1. stackable (at least blocks only one of your slots)
2. a 0/1 immortal/permanent creature that is moved to the opponent's side. (well, feral bonds are a bit nonsense)
Still, we got so many creature slots, why not make it occupy 3 random spots.