RulingHall of Heroes (rules 1.0–1.4)
Doctor Strange: Is Doctor Strange’s Invocation deck a legal target for Cosmo’s ability?
Question
Is Doctor Strange’s Invocation deck a legal target for Cosmo’s ability?
Answer
Yes, Doctor Strange’s Invocation deck (along with any non-villain or non-main scheme deck, such as Red Skull’s side-scheme deck) is a legal target for Cosmo’s ability.
— Boggs