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P/T Number 488 Language English Legal Formats Brawl, Commander, Competitive Brawl, Historic, Legacy, Modern, Pioneer, Timeless, Vintage Not Legal Formats Alchemy, Pauper, Standard Rulings (2/18/2022) 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." (2/18/2022) Isshin's effect doesn't copy the triggered ability

If Mishra, Claimed by Gix and a creature named Phyrexian Dragon Engine are attacking, and you both own and control them, exile them, then meld them into Mishra, Lost to Phyrexia

You can add a dash mode to most cards (without EtB effects) and assuming the dash mode isn't itself wildly under cost the card will remain pretty fair

Factory-sealed booster boxes from every era vintage Wizards of the Coast to modern