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
frail sandal
native sunBOT
Artifact — Equipment
Equipped creature can't be blocked and has shroud. (It can't be the target of spells or abilities.)
Equip 
Such cloaks are in high demand both by assassins and by those who fear them.
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
Artifact
Creatures you control are every creature type. The same is true for creature spells you control and creature cards you own that aren't on the battlefield.
, 
: Create a 2/2 blue Shapeshifter creature token with changeling. (It is every creature type.)
frail sandal
Also [[hero of bladehold]] seems kinda off
native sunBOT
frail sandal
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
native sunBOT
frail sandal
There are also good white board wipes like [[austure command]] and some other that don't hit your complete board.
native sunBOT
