Activate while the only monster you control is 1 face-up X-Saber monster. Equip this card to that monster. (1) It gains 800 ATK. (2) If it destroys your opponent's monster by battle, draw 1 card.
The (1) Continuous-like Effect applies while this card is face-up on the field.
This is treated as the effect of a Trap Card, not an Equip Spell Card.
The (2) Trigger Effect is mandatory, it activates & resolves on the field.
This effect activates in Substep 7 – End of the Damage Step.
This card must be face-up on the field to activate & resolve this effect.
This effect targets the 1 face-up "X-Saber" monster.
The effect to draw 1 card starts a Chain.
You can use "Tailor of the Fickle" to equip "At One With the Sword" to a different face-up monster.