Basically you are setting up a Righteous Inspiration to allow Graves a turn to do massive AoE damage with a buffed Grave Destruction.
That is the gist of the strategy. All you really need to look out for is a team that runs a blind or a stun/prism. If you cast Righteous Inspiration on turn one and they use a blind or a stun, it will affect your Graves as he enters the field and it will disable him for the round that he is buffed.
If you want to get fancy to, for instance, avoid the other teams Haunting of your Graves, you could open MPD and drop a decoy. But basically, given that Righteous Inspiration buffs the recipient's speed by 100%, you will be going first with your buffed Graves in 99% of all situations which allows you to drop that massive Grave Destruction. From there on out, it's just steady does it.
I'm not trying to be unconstructive here but just using these 3 pets on auto-pilot will still win you a lot of games as long as you pull off the Righteous Inspiration/Grave Destruction combo. If you don't pull it off, your Murkalot is just another human waiting to be eaten by an undead-AoE heavy meta.