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The bane of white-blue decks in that format was Cabal Torturer, and without Psionic Gift, the only good way to deal with this creature was to splash red or black as a third color, weakening your mana base

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While plausible, the fact that this only occurred with just a few random cards over multiple weeks would tend to imply that this is not very likely

1 Selesnya Guildgate

Card Type: Textured Holographic Foil (Ultra High Quality!!)