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Act of Treason is a sorcery that lets you gain control of one of your opponent's creatures for a turn and attack with it

They costed somewhere between 3000 and 5000 won, and were set up in the same way as their Japanese counterpoints

Crazy stuff

It doesn't copy whether that artifact is tapped or untapped, whether it has any counters on it or Auras and Equipment attached to it, or any non-copy effects that have changed its power, toughness, types, color, and so on

Also, if you use this and your opponent uses an instant in response before this resolves, their spell can still resolve.

It locks down any permanent relatively effectively, if not necessarily efficiently