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Another Lockdown Deck. This time using Gigadrowse.
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Sorry to be a party pooper, but Gigadrowse doesn't flip Erayo. When you CAST Gigadrowse, you may COPY it. The copies don't count as being cast. Same reason Giga doesn't act as Super-Firebreathing for Gelectrode or Wee Dragonauts. So Erayo only counts Giga as one spell cast, because the copies aren't cast.
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So does that mean if someone has, Lets say, Isochron Scepter with something printed on it, and Arcane Laboratory....That you could play something AND use Isochron Scepter in the same turn?