Magic The Gathering about "Cipher"?

ok, friend have card called "mortus strider" cost 3 mana , 1 black 1 white, it's ability when die come owner's hand. attached cipher in creature , said:" cipher have encode on creature , it's alright take cipher , creature." won't agree him unless give me source.

ok, friend have card called "mortus strider" cost 3 mana , 1 black 1 white, it's ability when die come owner's hand. attached cipher in creature , said:" cipher have encode on creature , it's alright take cipher , the...

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