Mulligan your hand to look for Execute and Whirlwind which will take down big threats and sweep his board of his 1/1’s. Kel’thuzad will help you immensely, but cards like Sunwalker and Ragnaros will also get great value. Ravenholdt Assassin is underrated in some of these matchups because he’s likely going to stick to the board and trade with big minions.