Ask Karn
How do you feel about the Myr?

They are a curious bunch, they are like ants or the Sliver. They have but the purpose to gather information of other being, curious indeed. 

Oh Great Father of Machines! We need you now more than ever.

I am Karn, I go by that name no longer 

So, now that the Praetors are all here they are planning a counsel. Care to crash it with Elspeth and myself?

Crashing was never my thing so to speak, the last thing I was in that crashed was the weather light and that did not end well for most. Though if an uprising is in order i shall play my part

Dude, you totally missed some cute pony thing causing chaos! Where are you when the awesome stuff happens,.
Anonymous

Pondering the salvation of my plane stranger…

Do you feel at all responsible for the invasion? I mean no harm.
Anonymous

Responsibility is something for those in the thick of the moment… no stranger what I feel is regret, at my own weakness, and the lack of failing my responsibility. I failed, and with that came the invasion… 

i hope this answers your quandary  

So. The weatherlight is still alive. Do you have anything to do with this? Isn't part of the weatherlight supposed to be living on inside you?
Anonymous

The whetherlight and I have a symbiosis, my arrival may have triggered a temporal time rift that may have transported my dear friend to a state of semi-existence. Such may be true for my father Urza and the blight Yawgmoth. But correlation does not mean causation, further investigation is required to determine that.

It has been a long time, Karn. I hope my children have been treating you well?

My fury will be voiced through the cleansing of my plane…

Karn I was just wondering if you ever discovered what I put in your heart. It, well it was from a true friend of mine from the past and I was just curious what you might have done with it. If you knew about it that is...

Father… the heart stone… was corrupted by the evils of phyrexia. The corruption had almost corroded the heart, and had nearly taken me whole. Had it not been for the bravery and honor of Venesser… a shard of the heart remains, melded with me for as long as I remain… yet the corruption had to be removed. Forgive me father…

You inspire many people with hope. I respect you greatly.

As I respect you Leonin warrior… 
May the multiverse shine upon your travels…

ps… good job handling the dragon 

What are the Praetors like?
Anonymous

I shall spare you the horror of the truth of Phyrexia…
My plane is in ruins, purity corrupted into such malevolent evil…