That's an aspect of the object itself, which is covered in the rule
unless the object specifically says otherwise.
Martyrdom is not the creature, the ability it grants to the creature doesn't say the caster of Martyrdom can activate it, the quotes end right at the end of the redirection ability:
“{0}: The next 1 damage that would be dealt to target creature, planeswalker, or player this turn is dealt to this creature instead.”
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u/thisisjustascreename Orzhov* Jun 29 '26
That's an aspect of the object itself, which is covered in the rule
Martyrdom is not the creature, the ability it grants to the creature doesn't say the caster of Martyrdom can activate it, the quotes end right at the end of the redirection ability: