Veranus and sixor can be replaced, by another good dragon and beast, siamat btw, is not crucial, but its a good utility card, i would recomend to craft that one, even more because you can run it in other decks not only highlander hunter
Veranus has good stats, provides you with swing turns and counts towards dragon synergies.
Siamat has decent stats, provides you with swing turns and is very versatile.
Zixor, Apex Predator has meh stats, but it still lines up well vs aggro. What makes it decent is the beast&rush package, which makes your deck more consistent. Zixor Prime is great, but it doesn't come up that often in my experience.
Ursatron instead ofUnleash the Hounds. (Unleash isn't great even with Veranus IMO, and even worse without.) You could put Ursatron instead of Zixor
So you get cards with more or less similar roles and synergies (a mini mech-package with Dragonbane). If you want to try Highlander hunter without investing lots of dust, this is definitely a valid option.
Veranus is necessary. It’s just too good with spear and unleash.
Siamat I guess can be replaced but with what I couldn’t tell you. He’s just insane and definitely just a safe craft. Easily can be put in any deck that isn’t Aggro. He’s versatile, a 2 for 1 or more always, and a huge threat.
Zixor is also great but the most replaceable of the three. But he is amazing and the deck runs two cards that can tutor him into your hand. It’s kind of a snowball effect of if you drop Zixor you probably have to drop diving griffin because you’re losing consistency on griffin drawing a rush minion.
- Siamat is critical if you want to remove a threat asap (Priestess of Fury for example) and leave you a decent body behind to apply the tempo back to the game. Or you can clear up to 2 threat, your choice. - Veranus is critical in Big Druid, Dragon Hunter and Priest matchups to remove their damn minions (which btw cannot be target by spell or hero power). Nice synergy with Spear, Unleash or any Rush minions. - Zixor is a nice beast, my favorite combo is to save Gryphon Battle cry or Scavengers to use *after* the Prime is in the deck so I can make sure it can be out next turn to remove problematic threat.
If you have to choose the order to craft: Siamat > Zixor > Veranus. - Siamat because it can be used in many deck: all Highlander decks run it, Big Druid runs it. - Zixor because it will stay with us for 2 years