I played on my iPhone against elemental who had 3-4 artifacts. When I put my Rex into play to steal one, all of a sudden all my other cards on board including hero were unplayable (at least they seemed like that - no wavy animation).

When I clicked on Rex, attack/ability buttons were not showing. By clicking on other cards, attack button was there and I managed to attack with my allies. When I used attack with all of them Rex animation turned on as if it was card available for use. I clicked but there was only attack option available.

I was hoping that next round things will recover but it was the same scenario all over again

Luckily I managed to win it anyway.