Chishiro, the Shattered Blade
Legendary Creature — Snake Samurai
Whenever an Aura or Equipment you control enters, create a 2/2 red Spirit creature token with menace.
At the beginning of your end step, put a +1/+1 counter on each modified creature you control. (Equipment, Auras you control, and counters are modifications.)
Lius Lasahido
Magic Online Promos (PRM)
• #98087Rulings
Only creatures can be modified. If a modified creature stops being a creature, it is no longer considered modified.
(wotc • 2022-02-18)
A creature with a counter on it is considered modified no matter what kind of counter it is or which player put it on that creature.
(wotc • 2022-02-18)
An Aura controlled by an opponent does not cause a creature you control to be modified.
(wotc • 2022-02-18)
A creature that is equipped is considered modified no matter who controls the Equipment that's attached to it.
(wotc • 2022-02-18)
Rulings
Only creatures can be modified. If a modified creature stops being a creature, it is no longer considered modified.
(wotc • 2022-02-18)
A creature with a counter on it is considered modified no matter what kind of counter it is or which player put it on that creature.
(wotc • 2022-02-18)
An Aura controlled by an opponent does not cause a creature you control to be modified.
(wotc • 2022-02-18)
A creature that is equipped is considered modified no matter who controls the Equipment that's attached to it.
(wotc • 2022-02-18)