Prismatic Soleil Driveshoot! (S-BT02A-UB04/0057EN) (S-BT02A)

You may only cast this card during your opponent's final phase if you did not take damage during your opponent's turn, a "Prism Dragon" with "Athora" in its card name is on your center, and your opponent's life is 5 or less.
[Counter] Deal 5 damage to your opponent! This card cannot be nullified, and its damage cannot be reduced. If your opponent's life would become 0 by this card, it cannot be changed by your opponent's cards.