FRONT: Untargetable
Ragnaros can't be dealt damage. You can't play or discard cards.
At the start of your turn, flip Ragnaros.
BACK: Ragnaros has +10 ATK while attacking and can attack only heroes.
Ragnaros can't be dealt fire damage. At the end of your turn, if you have exactly three resources, put eight Sons of Flame into play and flip Ragnaros.