Oh man, I had the most insane game earlier involving Fel Reaver. I'm playing as a priest against a mage at like 10 wins in Arena.
His turn 5, he has a 2/2 on board, and I have nothing. He plays Fel Reaver. I don't have a clean answer, but play Emperor Cobra, Shadow Word Pain his 2/2, and hope he doesn't have frostbolt. He doesn't, and he actually trades into my cobra (He had already burned 6 cards, and I guess he didn't want to risk me playing 4 cards, or freezing the felreaver, or something along those lines.)
Fastforward 8 turns or so. We're pretty far in the game, and I'm getting low on life, down to about 5 life after his attacks. He had a board of a 6/3, a 4/5, a 5/3 (Or something along those lines, the specific minions don't matter). He plays the last card in his hand, which is a second Fel Reaver! He has 6 cards left in his deck. On my turn, I play Stormwind Knight, attack his 4/5, and play lightbomb, leaving him with no cards on board, no cards in hand, and no cards in deck.