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This mechanic sets Deoxys apart from many other Pokmon and adds depth to its gameplay, allowing players to choose the form that best suits their strategy

It allows the user to declare 1 Card Name and then excavate the top card of their deck

After that I think Heroic Intervention, Fierce Guardianship, Swan Song, and Mana Drain are all huge in making sure your own board doesn't get wiped

Some good candidates for the effect are cheap characters like Owl, Logical Lecturer or Lefou, Bumbler who you won't mind getting banished in a counterattack, but anything you can use to take out your opponents' characters works well with The Queen

No, literally, she has a (likely deceased) cowboy sitting atop her head