Prismatic Field bug?

[Twio]

Prismatic Field
Hero Armor, 6cc, 6 durability, 1 defence.
"1 durability: During the next opposing player's turn, ability damage to your hero is also dealt to their hero."

This card is either bugged or badly worded. My opponent activated the ability, then played a Supernova which dealt 10 damage to my hero. However, the card effect says that it should only work during my turn. I hope it's a bug because otherwise it's ridiculously overpowered.

The game is Kazarack (241) vs A1 Twio (272)

[Mojumbo]

Heya,

That is a bug. Prismatic Field should not work on the same turn you activate it. It should only take effect during the next opposing player's turn. As such, Supernova should've only dealt you 5 damage in this context.

Hope that helps