So I was playing arena today, I had 4 spells and deathwing in hand, my opponent had no cards. I had mechanical yeti and emperor cobra on the board and opponent had boulderfist ogre. and I had lethal if I attacked and played deathwing, so I did that. My opponent gets the freeze spare part and topdecks drakonoid crusher to win the game while I'm just standing there with the rewind spare part and the other yeti I just drawn...