Osteomancer Adept
Opponent brought an Osteomancer Adept into player. It had the summoning sickness spiral. Opponent tapped the Osteomancer Adept and used its ability despite summoning sickness.
3
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stupak#25472
shared this idea
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Rezzahan#77802
commented
Probably had Tyvar, Jubilant Brawler on the field.