See Pin.

This seems... Efficiently costed?

Oh, it's ok, I'll put it at one of the broken rarities :)

Just kidding. I was hammering ideas out, I haven't thought through the development in much detail. Suggestions?

Why fight instead of just destroy since the card is white? Also risks running into the Avatar of Woe issue of using the ability vs. attacking.

Because chess queens have lots of mobility, but need to engage the piece they're taking on the spot, not from afar. I can junk the entire card, but I don't think "destroy" has the right flavour.

To be fair, I don't think red or green has made a card that fights attacking and/or blocking creatures. It seems reasonable to postulate that this might be in white's domain.