Legend Galakrond Warlock [Ashes of Outland]

In general you want to mulligan for invoke cards in a neutral matchup. If you're facing an aggro deck try to take out the Fiendish Rites and mulligan for some better early game options such as Ooze, Nether Breath and Dark Skies. If you're playing against something like a priest which is really slow you can keep Shield of Galakrond but I don't recommend to do it unless you already have a turn 3 or 4 as we will be life tapping a lot anyway. Albatross is always a safe keep as it's a good body to help you not take too much damage and get overwhelmed early on and it also has the great benefit of ruining any highlander or spell mage out there.

Going up against aggro the only thing you have to do is somehow gain tempo and stabilise around turn 5-7. For this try to assess what works best against the enemy class and fish for these early options. Don't remove invoke cards unless you have absolutely nothing but if you already have some removal to tempo the early game then it's perfectly fine to keep a Devoted Maniac when you have the coin.

It's also worth noting that even though Crazed Netherwing CAN help your opponent by damaging yourself it's also a strong board clear against most classes and offers a good body to compensate for the loss of health.