shadow63,
No, Caustic Caterpillar is not necessary. Like I mention in the 'Card Choices' section though, I love having a 1-drop that Convokes for Hogaak's Hybrid cost and provides a mainboard answer to Ensnaring Bridge and the occasional maindeck gravehate card. Insolent Neonate and Abrupt Decay / Assassin's Trophy are other solid options for the slots.

I'm sure it's been asked and you've already thought about it, but why not the always classy Liliana of the Veil ? 1 or 2 copies could be an asset!

Naksu,
I haven't really thought about Liliana of the Veil too much, tbh. I could see her in the sideboard maybe, for the super-grindy matchups? But in general, the deck needs 1- and 2-drop Creatures (to Convoke Hogaak and trigger Vengevine ) more than it needs a 3-drop Planeswalker. That said, the biggest reason may just be that I don't happen to have any, and she's still painfully expensive :-D

Thanks!

I just thought it would be a great way to discard Hogaak, along with her control toolkit built in. Faithless Looting seems to be your only other discard outlet and you probably should, or should not take into account that your only copy that game sits in your hand without a faithless looting. But it's all preferrence really, you play with what you know. I hope you get some results this time, but I'm sad you're not running ponza now.. :<

Spellskite could also be a SB card to consider for protecting Haakon. Have you also thought about Vexing Shusher against blue, or Dash Hopes against decks you end up racing against most of the time.

Oh, and one that I forgot was Bitterblossom . Feeds Hogaak steadily, but does nothing for Vengevine .. Still I think it could be more on the positive for making fliers.

F