Hearthpwn

I'm 8-3 against secret mage and 9-0 against all warlock types in the past 2 days (24-13 overall, 65% winrate from rank 15-10). In my experience the hardest matches are jade/big druid, kingsbane rogue, and big hunter. But these decks are few and far between (that being said I did play a stretch of 7 games where 6 of those games were against those decks which was garbage). 50% of my matches are warlock and mage.

Do I think Alexstrasza is necessary? Probably not but it IS an extra dragon and this deck is already slim on them. So removing her gets rid of a chunk of your synergy. She's also won me many games by allowing me to burst down my opponent with my board or by allowing me to survive pyroblasts from secrets mage so I can kill them next turn. There are probably other cards you can use but Alexstrasza is definitely a good fit for this deck.

Do I think Shadowreaper Anduin is necessary? Less necessary then Alexstrasza. The only time I've ever cleared a board with him is against mages, and if you're making it to turn 8 against a secrets mage you're already in decent shape - but by playing him you're also killing your healing which is really important in that matchup. I don't know what I would swap for him but I don't think it's an essential card for this deck.

Have you tried subbing glimmerroots for mana geodes? They can get out of control fast if your opponent doesn't have an answer.

Also makes the curve a little more attractive

Al'Akir the Windlord

Sometimes I just forget to end my turn

This should have cost 5.