The rest of the deck is mostly to over power Thrun, keeping in mind that you are aiming to do 21 commander damage. There is pretty much no way this deck could win by dealing 40 regular damage.
This deck is also great for 1 on 1 play. Expect to get lost in the shuffle if you are playing at a table of 6 players. Thrun is a great 4 mana cast because of hexproof and that he can't be countered, but when he is attacking, you will want to have 6 mana to be able to regenerate him. Definitely get 1 - 3 deathtouch creatures out and some low converted mana cost artifacts out like Colossus Hammer, Trailblazer's Boots and Vorrac Battlehorns out early to prepare for battle. And, in general, do not equip or boost creatures other than Thrun, unless you are giving a deathtouch creature reach with Spidersilk Net. This also has the new card Colossification from the new Ikoria set, which will be in the mail in a few days. That card should be killer in commander. The general idea in this deck is also to give Thrun some beef by giving him trample, such as Mythic Porportions or unblockable, as in the case of Whispersilk Cloak.
gatherer.wizards.com just crashed 2x so if I get any views I come back later and give links.
