Without cheap characters of their own or a proper sweeper effect like Be Prepared or Grab Your Sword, players facing down this type of strategy would quickly find themselves at an extreme disadvantage
Lorcana used cold foiling for foil cards in the first sets but uses a separate process for Enchanted
Isshin, Two Heavens as One's ability affects only triggered abilities with conditions that are directly related to attacking, such as "whenever [this creature] attacks" or "whenever you attack with one or more creatures." It does not affect triggered abilities with other trigger conditions, such as "whenever [this creature] becomes tapped." Isshin's effect doesn't copy the triggered ability

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it just causes the ability to trigger twice