Adherent's Heirloom Bug
Adherent's Heirloom doesn't always seek a creature. Most common issue is the card doesn't seek a creature when you have the most prevalent creature type in your deck already on the field.
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Atom#91761
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Atom#91761
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Also doesn't seek a card if the most prevalent creature type in your deck is also in your hand. The interaction been testing with is Wizard, specifically Vivi.