Hearthpwn

Doing really well with this deck. Missing one cryptology and call to adventure. Replaced with Zilliax and Leeroy. Leeroy is a great finisher.

Dude, great deck! I can't believe this is only my first time watching you! And as someone who mains pally, I was really impressed with your deckbuilding. Only negative comment I have involves the first game you played with it - when it came down to what to magnetize with your Wargear, a Galvanizer or one of the little bots, you should've chosen a Galvanizer. The reason for this is that his most likely removal (which he did use) was his remaining Sap, and Galvanizer has a battlecry that's always useful.

I was light one Call to Adventure and two Galvanizers, substituted with Mecharoo and Faithful Lumis.

Hey, I enjoy the deck! I replaced 2x Blessings of Kings with Zilliax and Glass Knight, as well as 1x Aldor Peacekeeper out for a Lightforged Blessing. I wanted to try the Glass Knight angle but it might take away more than it adds, I suppose we will see as I play more.

How i can upgrade this paladin? 

Zilliax

Kangor's Endless Army

i think are both valid options

Replacing one copy of Blessing of Kings with Zilliax is the most straightforward upgrade. Other than that, there is no fine-tuned full-cost build of this idea, the deck is different from Kangor's builds and Kangor's does not give the deck anything.

You don't want Kangor's in this deck. While it is yet to be determined whether a more midrange approach is better than the value-approach with Kangor's, Kangor's requires a bit different deck construction, most notably cutting Explodinator and Replicating Menace.

What if i add Leeroy? I think this can give me victory one time

It could work, but there simply has not been any testing done on a full-cost build, so beyond the obvious Zilliax addition it would all need to be tested. Leeroy is usually less important in Egg/Whelp builds, but it's not an impossible idea.