Tengu format ruling
At One With the Sword

Card effect (current official text)Activate while the only monster you control is 1 face-up "X-Saber" monster. Equip this card to that monster. It gains 800 ATK. If it destroys your opponent's monster by battle, draw 1 card.
Rulings
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.
- This effect targets the 1 face-up "X-Saber" monster when activated.
- You can use "Tailor of the Fickle" to equip "At One With the Sword" to a different face-up monster.
- 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 is treated as the effect of a Trap Card, not an Equip Spell Card.
- 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.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the Tengu forum — sourced change requests get reviewed.