Demonic Dragon Deity of the Black Sun, Gaen (X2-BT01A-SS01/0019EN) (X2BT01A)

This card can only enter the field if your flag is "Dragon Drei".
While you are [Transform] into this card, this card cannot be destroyed, nor returned to hand, and its ability cannot be nullified.
When you are [Transform] into this card, your opponent cannot draw cards during his or her next turn.
When this card attacks, destroy all monsters on your opponent's field.
[Act] You may discard two size 3 or greater monster cards from your hand and pay 2 gauge. If you do, you gain 5 life!!
[Transform] [Pay 3 gauge]