Deathknell, and whether or not a permanent has Deathknell, is a characteristic of the permanent and may be checked or referenced by other Game Effects.
§ 808.3 Core Rules PDF (officieel)
§ 808 Deathknell
§ 808 Deathknell
Deathknell, and whether or not a permanent has Deathknell, is a characteristic of the permanent and may be checked or referenced by other Game Effects.