
If a creature attacking causes a triggered ability of a permanent you control to trigger, that ability triggers an additional time.
Isshin, Two Heavens as One has 9 printings, first in Kamigawa: Neon Dynasty (2022). EDHREC ranks it #1,463 among Commander cards. It appears most in Kaalia of the Vast decks (18,569 on EDHREC). 1 public deck on TCG runs it. It has 2 official rulings.
Deck counts from EDHREC.
Cards that show up in the same decks on EDHREC.