I made a purify+overdrive+charger version of the deck. The thing is, when looking at your deck, purify doesn't seem necessary at all unless it's just there to counter poison or SoSa. All the creatures you are Overdriving either already have enough health so health isn't a problem, or don't need the overdrive. Oty being overdriven loses its ability, so a charger would be better overdrive candidate, and SoFo has more than enough health to worry about overdrive.