Just like how those clamouring for Hogaak, Arisen Necropolis or Faithless Looting to get banned in Modern a couple of months ago should have been registering the deck all along, if you want to win and genuinely believe a card needs banning in Pioneer, then you should be playing it and trying to break it
In the case of Boon-Bringer Valkyrie, it also gains flying, first strike and vigilance until the end of the player's turn

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Breaking News cards, another sub-set being introduced in Thunder Junction, are all crimes
2 Eluge, The Shoreless Sea Mono-Blue Free Spells Mono-colored decks are a bit of a rarity as Magic pushes to create more and more powerful legendary creatures with diverse color options, but Eluge, the Shoreless Seas is an exceptionally strong Fish to build around