Yeah, platebreaker definitely screws over wild far more than standard. However, at the end of the day, it's a very niche tech card that likely won't see much play. The only way this slots into a deck it's when armor classes become problematic. Otherwise, nobody wants to play a generic 5/5. The existence of this card simply prevents warrior (and sometimes druid) from running rampant with stupid amounts of armor because the second they do, they'll start running into this card.
I get where you're coming from but ultimately, I don't think it'll be a problem.
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DONE