Le personnage de la carte Isshin, Two Heavens as One, de l'édition Kamigawa: Neon Dynasty et illustrée par Ryan Pancoast, est inspiré du samouraï Miyamoto Musashi, qui a conçu la technique d'épée "Niten Ichi-ryu" ou "the school of the strategy of two heavens as one".

Source 1 (Two Hearts, One Family - "[...] most cultures have traditionally fought with only one weapon (and often a shield). Miyamoto Musashi created a two-sword style called nitōichi (二刀一, "two swords as one"), and Isshin here follows in his footsteps by inspiring all creatures to double your attack triggers!") -