Many shadow cards explicilty say, something like "when this card comes out of shadows do X".

However (a version) of Tyrion Lannister says something like "Response: when a card comes out of shadows Tyrion gets +2 Str, this, that, and the other thing."

Does he trigger himself?

Hand of Osiris said:

Out of curiosity, is there anything about the card or its wording that makes you think he cannot? Or are you just thinking that "a card" may not include "this card"?