Not A Bug Underworld Breach allowing noncreature cards to escape? I was able to cast Death's Shadow from my graveyard


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I was playing GDS against burn and had a combo turn with DRC in play, UB casting Bauble multiple times. After a few iterations, I noticed that the game would have allowed me to cast Death's Shadow and DRC from my graveyard for the normal UB Escape cost. I didn't do this, but the card shouldn't allow this right?