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Isshin, Two Heavens as One When creatures with powerful attack effects like Hero of Bladehold or Anim Pakal, Thousandth Moon are on the field, their abilities become even more potent when Isshin, Two Heavens as One is aroundthey trigger twice

Who may look at the face of a face-down card

The first of these is that as you declare attackers, you may have any number of creatures with banding, and up to one without, become a band (702.21c)

Since it's also the lightest Exhaust ability, there's a strategy to use it to trigger those effects

+1: Target artifact or creature loses all abilities and becomes a green Elk creature with base power and toughness 3/3