Bug Sile De Tansarvile
So it was at the end of the round, I still had 14 cards in my deck and Sile was the only remaining card with Immune Boost which is a bronze special card. She could clearly play it but I was never able to. Then she was scorched as shown in the graveyard on the first pic. I think it's a bug. She should have been able to cast Immune Boost on herself or another unit.