This card reads, Whenever one or more creatures attack, Lightmine Field deals damage to each of those creatures equal to the number of attacking creatures. In essence, this does double damage now, and thats a great way to deter would-be attackers
Pokemon Breakthrough was the first of the upcoming XY BREAK series, a set that revealed the first use of BREAK cards and a set that I remember for creating art that I still love to this day
None of these are money cards, but they are all very flavourful and playable
While its plenty powerful, its the effect on perceived barrier-to-entry that really posed a problem because casual players watching Commander games in passing could reasonably assume that they needed hundreds (now thousands) of dollars in Power-9 mana as table stakes, just to join the format
ALSO READ: Transformers: Rise of the Beasts reveals first look at Autobots and Decepticons However, her ability is somewhat counterproductive
On the other hand, additional abilities a creature gains aren't considered to be printed on the card, so backup won't grant them