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You are a monster :laugh:

They have clearly different names and types. One has the type Knight, the other has not. All you have to check is does the card have the type Knight? Ardenvale Knight does, therefor you can cast...

The creature part is a Knight, the adventure isn't so you can't cast the adventure from your GY via Haakon (unless it had Changeling). It's clear enough.

They're typed as instants/sorceries, so I imagine cost reducers work.