Hearthpwn

Strategy: Mulligan for Pyroblast. Ideally, both of them. After that you want things to keep you alive until he plays Millhouse Manastorm. Hang on to Arcane Intellect until Millhouse as well so you can dig as deep as possible when he shows up, unless you drastically need something to keep you alive like an Ice Block or a Frost Nova. If you can Duplicate some Kobold Geomancers or, sub-optimally, some Mana Wyrms then that's cool too.

Essentially your win scenario is having some huge spells and some +spell damage in your hand so that when he plays Millhouse you can empty your hand and kill him in one turn. The end. I guess you can get risky and try to get copies of things if he uses Lorewalker Cho, but it's not a scenario I'd be hoping for. Getting him to give you bonus Polymorph is a pretty safe bet because you're not playing a ton of minions so you'll most likely get more value from it than he well.