I think some protection for your commander would be good, you want to attack but you do not want to have to cast him every other round, so stuff like [[whispersilk coat]] or maybe even some of the swords might be a good call. Anything that gives him either evasion or indestructible [[sword of hearth and home]] should also be nice.
I also do not like [[maskwood nexus]] since 90% of your creatures are already oxen so the rest does not really matter in my opinion
#"Cow" (Ox) Themed Deck Suggestions
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Artifact — Equipment
Equipped creature gets +2/+2 and has protection from green and from white.
Whenever equipped creature deals combat damage to a player, exile up to one target creature you own, then search your library for a basic land card. Put both cards onto the battlefield under your control, then shuffle.
Equip 
Also [[hero of bladehold]] seems kinda off
Or more of your flicker spells cause then you can just blink your commander and have 2 triggers of him
But I am not sure if this is a nonbo for your comabt
You might also want to cut [[anointed possession]] I think you mainly have your commander plus 2 or 3 cards that make tokens regularly. So it is most of the time big mana do nothing and with a simple flicker for example you have an instant payoff
There are also good white board wipes like [[austure command]] and some other that don't hit your complete board.
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: Create a 2/2 blue Shapeshifter creature token with changeling. (It is every creature type.)