Priest of Haunted Edge is able to use his ability even while summong sick.
Priest of Haunted Edge was able to be tapped and sacrificed even though it had just entered play on the same turn. Creature did not have haste and no other abilities existed to allow it to use tap abilities while summoning sick. To reproduce play Priest of Haunted Edge and attempt to use ability while creature has summoning sickness.
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CuLue#50220
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Rezzahan#77802
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Did your opponent have Tyvar, Jubilant Brawler on the field?