Hello. If you return Ciletos to an opponent’s hand (such as with Vanish), its Deathrattle for 8 damage triggers if the opponent’s hand is full and then it respawns.
If his hand is full like you said, this is normal.
This isn’t a bug.
              
              
              1 Like
            
          Trying to send a minion to a space that has no room will destroy the minion, that’s the intended behavior
So returning the minion to a full hand (10, 11 or 12 cards if it has been inceased), to a full deck (60) or trying to make it change board side will the other side is full, will indeed destroy it and trigger its deathrattle
              
              
              1 Like